Windows OS Hub / Windows 10 / How to Repair Broken EFI Bootloader in Windows 10, 8.1

February 14, 2018 Windows 10 Windows 8

How to Repair Broken EFI Bootloader in Windows 10, 8.1

In this article we will learn how to repair Windows 10 / 8.1 /8 bootloader on a computer with UEFI. The corruption of the Windows bootloader can occur after the installation of the second OS (in Dual Boot configurations), be caused by the erroneous actions while failure recovering, removal of some data on hidden partitions, malicious software (virus, ransomware, etc.) and for some other reasons.

In this article, we will show how to repair a damaged or deleted bootloader on Windows 10 / Windows 8.1 / 8 systems with EFI. This guide should help in case when the system does not boot due to missing or damaged boot configuration in EFI\Microsoft\Boot\BCD.

Contents:

The boot configuration data for your PC is missing: EFI\Microsoft\Boot\BCD
Automatic Windows Bootloader Recovery
Manually restoring the Windows 10/ 8 bootloader using the installation media

The boot configuration data for your PC is missing: EFI\Microsoft\Boot\BCD

If the bootloader in Windows on UEFI system is corrupted – it’s impossible to start the system or user facing a blue screen with the following error:

The boot configuration data for your PC is missing or contains errors.
File :\EFI\Microsoft\Boot\BCD
Error code: 0xc000000f

$boot configuration errors 0xc000000f or missing file \EFI\Microsoft\Boot\BCD$

All this can imply corruption or even total removal of Windows 10 / 8 bootloader configuration – Boot Configuration Data (BCD). You won’t be able to recover the BCD loader using bcdedit. When running this command, the following error appears:

The boot configuration data store could not be found.
The requested system device cannot be found

The matter is that the BCD loader configuration in Windows 8 installed in UEFI mode is stored on a separate hidden EFI volume (100 MB in size on FAT32 file system). Bcdedit can’t see it and, therefore, manage the bootloader configuration on it.

Automatic Windows Bootloader Recovery

The procedure for automatic recovery of the bootloader, which is used in the Windows Recovery Environment (WinRe), is usually powerless in such cases. But it’s worth trying all the same:

Try to boot system from the recovery disc or installation Windows 10 media
On the installation screen, click the Restore System
Then select Troubleshoot -> Startup Repair and select the OS whose bootloader you want to try to recover
But most likely the result will be negative: Automatic Repair Couldn’t Repair Your PC

Manually restoring the Windows 10/ 8 bootloader using the installation media

Let’s proceed to the procedure of manual recovery of the EFI boot loader on Windows 10 / 8.1.

So to recover the loader (BCD) configuration, you have to boot from the original installation Windows 10 media (or a recovery disk or a special EFI bootable flash drive) and open the command line choosing System Restore – > Troubleshoot-> Command Prompt or pressing Shift+F10).

Start diskpart:

diskpart

Display the list of disks in the system:

list disk

Select the disk with Windows installed (if there is one disk in the system, it will have zero index):

1	sel disk 0

Display the list of volumes in the system:

list vol

In this example, you can see that the EFI volume (it can easily be recognized by its size of 100 MB and FAT32 file system) has the index volume 1, and the boot partition with Windows installed is volume 3.

Assign any disk letter to the EFI volume:

1	select volume 1

1	assign letter K:

A line that indicates the successful assignment of the drive letter to the EFI partition should appear:

DiskPart is successfully assigned the drive letter or mount point.

Close diskpart:

exit

Go to the bootloader directory in the hidden volume

1	cd /d k:\efi\microsoft\boot\

In this case, K: is the drive letter assigned to the EFI partition just above. If the \EFI\Microsoft\Boot\ directory does not exist (error The system cannot find the path specified), try the following commands:
cd /d K:\Boot\
or
cd /d K:\ESD\Windows\EFI\Microsoft\Boot\

Recreate the boot sector on the boot partition

1	bootrec /fixboot

Delete the current BCD configuration file by renaming it (save the older configuration as a backup):

1	ren BCD BCD.bak

With bcdboot.exe, create BCD store again by copying the boot files from the system directory:

1	bcdboot C:\Windows /l en-us /s k: /f ALL

where C:\Windows – is the path to the directory with Windows 8 installed.
/f ALL – means that the boot files have to be copied including those for UEFI and BIOS computers (potential ability to boot in EFI and BIOS systems)
/l en-us – is a type of the system locale. By default, en-us – English (USA) is used.

Tip. If you use a localized version of Windows 10 / Windows 8, the command will be different. For example, in the Windows version for the UK, use the following command
bcdboot c:\Windows /l en-uk /s K: /f ALL
Version for Netherlands:
bcdboot c:\Windows /l nl-NL /s K: /f ALL

Possible errors:

BFSVC Error: Can not open the BCD template store. status – [c000000f] – check if the entered command is correct and whether you have localized Windows (in such case you need specify the local language code in a correct way);
BFSVC Error: Error copying boot files from Last Error = 0x570 – try to check drive with the help of command: CHKDSK K: /F

Execute the commands:

bootrec /scanos bootrec /rebuildbcd

Now you have to restart your computer. Then the Windows Boot Manager appears in the list of bootable devices, where you can choose desired operating system to start.

BCD bootloader configuration has been successfully restored!

The instructions for restoring the EFI bootloader in Windows 7 are slightly different – see the article Repair Deleted EFI Boot Partition in Windows 7.

How to Allow Multiple RDP Sessions in Windows 10

106 comments

Dual operating system, cannot boot Windows 8, tried Boot-Repair-Disk and Windows repair, GRUB, EFI - ServerAB September 21, 2014 - 9:33 am

[…] I followed the instructions in here: http://woshub.com/how-to-repair-uefi-bootloader-in-windows-8/ I see that my C: is not reachable, and the info of my volume is Hidden So I have to do […]

Mick November 9, 2014 - 5:16 pm

Thanks. It helped me well!

Eras November 28, 2014 - 1:32 am

Hello, I get everything ok, respecting all spaces and / \ positions, and get stuck here: ( I assigned letter “i” instead of “k”)
i:\EFI\Microsoft\Boot>ren BCD BCD.bak
The system can not find the file specified

Max November 28, 2014 - 6:01 am

ren BCD BCD.bak need to back up current BCD config.
In your case probably BCD has already been deleted. Follow the next step – where it is recreated.

Eras November 28, 2014 - 12:22 pm

Thank you for the quick reply! On the next step, skipping the previous, I get this message:
“Failure when attempting to copy boot files”

I’m doing this using the built in recovery tools inside a HP All in one 20-b323w, and using the recovery inside a usb uefi drive with Windows 8 64 bit in it.

Here’s a picture: http://i.imgur.com/2rmM2CT.jpg

Thank you for your help!!!

Kino July 23, 2016 - 7:44 pm

I got that error too at first. Try the next FAT32 drive. Assign it a different letter and trust me it will work.

Ruoaa December 1, 2014 - 4:30 am

I`m trying to replace a linux i guess this won`t work for me !

Max December 2, 2014 - 10:14 am

You have an error in the syntax of windir path
Try specify path c:\windows instead c:windows

Chris December 7, 2014 - 8:03 pm

I followed the steps but in the last step i get this message:
BFSVC Error: Could not open the BCD template store. Status = [c000000f]
Any ideas?

Chris December 7, 2014 - 8:49 pm

Please disregard my previus comment. The issue was solved by replacing / with \ on the last command!!!
At first i wrote bcdboot c:/windows /l en-us /s /k: /f ALL instead of bcdboot c:\windows /l en-us /s /k: /f ALL
Even a wrong backslash counts!!!

Matt October 4, 2017 - 2:15 pm

Thank you Chris. Same problem here. /\

Michel January 14, 2015 - 9:43 pm

For a moment I thought I would never be able to bring my laptop back to life again, but this page helped me to fix the problem. Just needed to change the language in the syntax to nl-NL and find the right volume and file (was 300MB in my case, but also a FAT32, also slighly different name of the BCD-file). Thanks a lot!

Felipe January 25, 2015 - 3:58 pm

Hey guy.. Thanks a lot.. It’ve worked for me.

Daniel February 20, 2015 - 5:09 am

Hello, I followed your guide and seems like it would work great but I have a slight issue. I have tried to dual boot my computer which worked until Windows 8 had to update and I updated it while I was sleeping and now it will not boot up. When I list the volumes I get the following
“DVD rom – UDF
System Reset – NTFS
Windows 8 – NTFS
Windows 7 – NTFS
Random Item (other harddrive for storage ) – NTFS”
I get nothing else I do not have the bootstrap or FAT32 any suggestions? I no longer need the windows 7 So if I could get rid of it that would be great.

Max February 20, 2015 - 1:10 pm

Repair bootloader this way and then delete Windows 7 boot entry with msconfig utility (fron win 8)

Daniel February 21, 2015 - 12:20 am

How would I rebair the boot without the FAT32?

Daniel February 28, 2015 - 12:46 am

How would i repair the boot without having the FAT32 reserve file on any of my harddrives?

Daniel February 28, 2015 - 7:18 am

I skipped the steps with the FAT 32 and got all the way until renaming BCD I fixed it and was successful but when I went to rename it access got denied. When I attempted to copy the boot files they also failed. Any other ideas?

Max March 2, 2015 - 11:05 am

First, check that your PC is support UEFI (this article is not applicable for BIOS systems).

Next, check you hard disk partition table style (list disk command in diskpart). It can be GPT (not MBR).

How to manually create partition for UEFI:https://technet.microsoft.com/en-us/library/hh825686.aspx

Viki March 9, 2015 - 3:37 am

Hi Max,
All went well until I got to: ren BCD BCD.bak
where I got the response: The request could not be performed because of an I/O device error.
Any Suggestions?
Viki

Max March 11, 2015 - 7:57 am

You BCD can be broken. Skip this step and move to the next, where you recreate BCD config.

Leander March 12, 2015 - 6:32 pm

hi, i have nearly the same problem, buti dont have that fat32 with 100 mb partition, it looks like this:
Vol 0      F    Windows 8   UDF     DVD-ROM       3623MB     healthy     (no info)
Vol 1      C   Windows8_OS    NTFS    Partition              417GB      healthy     (no info)
Vol 2     D Lenovo                   NTFS    Partition              25 GB       healthy     (no info)
Vol 3            WINRE_DRV NTFS Partition    1000MB healthy    hidden
Vol 4           SYSTEM_DRV    FAT32 Partition             260 MB healthy      hidden
Vol 5                                           NTFS    Partition              450MB healthy       hidden
Vol 6             PBR_DRV    NTFS    Partition 20 GB healthy hidden
Vol 7     E      USB DISK      FAT32        Removable       7279MB   healthy    (no info)
Vol 8             LRS_ESP         FAT32       Partition          1000MB   healthy    hidden
My english is not the best, in from germany, sorry, but i hope you can help me. i tried with vol 4 instead of your vol 1 and replaced the language to instead of en-us to de-de. i did anything u wrote and it seemed to do what it should. but when restarted my laptop, the same message with that ” 🙁 ” – Smiley came, i cant start windows and then it restarts again, same blue screen with the unhappy smiley, collecting information again , restarting… and this repeats infinitly. hope you can help me, thanks

Michael March 21, 2015 - 4:28 pm

Thank you very much. Works perfect. Made my day

Vikram March 24, 2015 - 9:19 am

Thanks for the detailed guide. I am getting the same error only difference being I am using Win 7. In my case the windows Installation media is not seeing my windows partition. (On clicking repair conputer the box is blank wheras ideally it should be showing the current installation path of Windows) What should I do ? In Linux I am able to access the win partition. Could this be due to wrong setting of boot flag? I had actually installed Linux first and then Win 7 . Both of them are in 2 different hard disks. When I installed Win 7 , I think the EFI folder used by linux was shared by windows and a separate partition was not created. So in this case , what should I do? – Reset the bootflag to Linux partition where EFI part resides and then make the changes you suggested here?

TrishG82 April 15, 2015 - 5:08 pm

Hi I’m having problems as above – everything works up to bcdboot C:\Windows /l en-us /s k: /f ALL
“Then I get Failure when attempting to copy boot files.”
If I try it without the switches and only bcdboot c:\windows – then I get……
BFSVC Error: BcdOpenSystemStore failed with unexpected error code, Status = [c000015c]

Any other suggestions please?

Dan April 29, 2015 - 7:08 am

Check the path to the drive K:\ and folder C:\Windows. They must exist

Roman April 18, 2015 - 4:47 pm

So what do I do if I’m getting this error and can’t boot from the original (win8.1 x64 OEI)installation cd? I’ve already set the dvd drive as 1st boot priority and restarted. Got the usual “verifying DMI pool data” message then:
Boot From CD/DVD:
Boot From CD/DVD:
then it goes right back to the same error screen. It does this continuously and I’m all out of ideas.

Cristian April 25, 2015 - 5:50 am

Thank you, Thank you, Thank you
Works perfect

Do Xuan Thao May 5, 2015 - 9:48 am

Thanks you very much!

ludba June 14, 2015 - 3:13 pm

i got success all the way, the final step bcdboot c:\windows /l en-us /s /k: /f ALL, gives me error message “failure when initializing library system volume” what those that mean? what can i do?

travisjayday June 15, 2015 - 3:33 am

OMG!! Thank you sooo much. I thought I had to do a full restore! Everytime I booted Win 8, it didn’t show a login screen (no password text field, only a blue screen with shutdown options…). You totally saved my ass. By the way, this happened after a Linux install with dual boot (Kali Linux)

Allan Valdivia July 15, 2015 - 7:58 am

Thank you very much for your help! I managed to recover my laptop stopped to four months. A big hug from Brazil.

Arturo Bandini July 15, 2015 - 9:21 pm

Hi, in the final step “c:\windows /l en-us /s /k: /f ALL” do I have to change “en-us” to my language? and, I have to receive a succes message after that?

Max July 20, 2015 - 7:05 am

Likely EN-US should be used for any system language

jan July 30, 2015 - 6:57 am

I am gettint an erorr when running the last command:
Could not open the BCD template store. Status = [c000000f]

Any advice?

XeON January 14, 2019 - 11:44 pm

I have the same problem.

Ruud from the Nethetrlands August 11, 2015 - 7:22 pm

This is great!!!! I’ve spend hours trying to migrate a Win8 installation to another SSD, but I was stuck at this stupid error. Now I´m back at the login prompt.

AlexSG August 16, 2015 - 9:43 pm

Thank you! After an hour of reading other solutions that did not help, this excellent post was able to assist me in repairing the Windows 10 bootloader.

Cameron September 1, 2015 - 5:51 am

I did the steps until this line, cd /d k:\efi\microsoft\boot\, it says “Access is denied”. How do I overrride this?

Cameron September 1, 2015 - 5:51 am

My Lenovo Yoga 2 Pro runs in Windows 10 Student OS to be specific.

chile September 13, 2015 - 1:57 am

Muchas gracias, maestro, me salvaste la vida.
Thankyou very much!!

Cal October 6, 2015 - 3:08 pm

Tx dude. This worked perfectly

Erik October 21, 2015 - 10:38 am

Thanks! Worked fine for me (windows 8.1).
Stupid btw, that the windows tooling does not work on the hidden partition…..

raju October 23, 2015 - 8:47 am

Thanks working fine useful information

Wolfgang December 1, 2015 - 8:12 pm

Thanks a lot !!! Very useful information. Worked perfect for my OS (Win8.1, German language).

Nick S. December 23, 2015 - 1:35 am

Thanks a lot.
Worked for me too on Windows 10. I read many forums and you were the only one to provide the correct instructions for creating the BCD store again:
bcdboot C:\Windows /l en-us /s k: /f ALL
In my case I actually had to run the free Boot-Repair tool afterwards but I got the job done.

Joseph A. December 28, 2015 - 4:28 pm

is it same with error code:
0xc000014cv?

Stephen Osterday February 10, 2016 - 9:21 pm

Mine went fine until I got to the bcdboot command. When I ran that it returned the syntax as if I had issued a /?. Dell says my OP is corrupted and wants me to Reset to factory state. I’m trying to avoid that at all costs!!!! I’ve upgraded it from Win 8.1 to Win 10, installed a whole bunch of APPs, and run various tweaks on it over a year-and-a-half.

CJ February 11, 2016 - 6:29 am

I don’t normally comment on sites, but I just had to come back here and say THANK YOU! I converted a Physical Windows Server 2012 R2 with Disk2VHD to hyper-V and it wouldn’t boot. Using this exact proceedure helped me fire up the Hyper-v instance as a direct imported Gen 2 VHD.

AE February 14, 2016 - 5:42 am

I had accidentally removed the windows EFI partition during a fedora install, so when trying to “cd /d k:\efi\microsoft\boot\” the directory wan’t there (there was only an efi\fedora directory). I simply created the correct directory structure using mkdir, followed the rest of the instructions, and was able to boot from windows upon system restart.
Thanks for the help!

ravi teja February 16, 2016 - 1:42 pm

hi, i have nearly the same problem, buti dont have that fat32 with 100 mb partition, it looks like this:Vol 0 F Windows 8 UDF DVD-ROM 3623MB healthy (no info)Vol 1 C Windows8_OS NTFS Partition 417GB healthy (no info)Vol 2 D Lenovo NTFS Partition 25 GB healthy (no info)Vol 3 WINRE_DRV NTFS Partition 1000MB healthy hidden Vol 4 SYSTEM_DRV FAT32 Partition 260 MB healthy hiddenVol 5 NTFS Partition 450MB healthy hiddenVol 6 PBR_DRV NTFS Partition 20 GB healthy hidden Vol 7 E USB DISK FAT32 Removable 7279MB healthy (no info)Vol 8 LRS_ESP FAT32 Partition 1000MB healthy hiddenMy english is not the best, in from germany, sorry, but i hope you can help me. i tried with vol 4 instead of your vol 1 and replaced the language to instead of en-us to de-de. i did anything u wrote and it seemed to do what it should. but when restarted my laptop, the same message with that “ ” – Smiley came, i cant start windows and then it restarts again, same blue screen with the unhappy smiley, collecting information again , restarting… and this repeats infinitly. hope you can help me, thanks

ravi teja February 16, 2016 - 1:44 pm

help me with this type of disk volumes
kindly explain me in detail about the solution to hidden files.

AL March 4, 2016 - 4:30 am

Hi Max, doe.s this solution works with windows 10 as well? I am having a similar problem.
Thanks, AL

Steven April 4, 2016 - 10:23 pm

I have read many similar articles on how to fix Windows boot problem in order to get mine working again. This is the ONLY article that actually works. You have helped me a lot. Thank you so very much!!!

Sush May 16, 2016 - 11:04 pm

I Just have to say i Googled the inital error and tried virtually ALL the other fixes [I’m sure you’re all aware of the ones i’m talking about], and it wasn’t until i got here that my issue was resolved. Thank YOU! for posting this – i’m saving this article for future use!

Kiran May 20, 2016 - 8:20 am

A big thanks to you .. :):)

Liam May 22, 2016 - 4:10 pm

This as well as everyother “fix” for the Windows Bootloader does not work. First I can’t even see the “hidden partition”, then if trying to do the other steps I get “Failure when attempting to copy boot files” when doing bcdboot C:\Windows /l en-us /s g: /f ALL

Ignacio May 28, 2016 - 4:59 am

Thanks mate!! it did work!

Incognite June 11, 2016 - 9:27 am

Thanks! Nothing worked and your solution did work, even for Windows 10!

Jack June 15, 2016 - 9:55 pm

Thanks for the helpful article.
I just have a problem, DISKPART shows my FAT32 partiotions (including the EFI partiotion) as raw in the Fs column. Whereas in a live Ubuntu CD and GParted app, those are shown as FAT32 partiotions.
I’ve successfully assigned the letter (k:) to the EFI volume but couldn’t go the bootloader directory of the hidden EFI volume. The error I encountered is:

This volume does not contain a recognized file system. Please make sure that all required file system drivers are loaded and that the volume is not corrupted.

How to deal with that?
Thanks

admin June 16, 2016 - 5:40 am

It seems that your FAT32 partitions are damaged. Try to re-create the EFI and MSR partitions using guide for Windows 7: http://woshub.com/how-to-repair-deleted-efi-partition-in-windows-7/

Jack June 16, 2016 - 5:43 am

Thanks, I’ll try that

Jack June 16, 2016 - 6:59 am

Thanksss. the tutrorila solved my problem:
http://woshub.com/how-to-repair-deleted-efi-partition-in-windows-7/
Althogh I whish I could understand what’s going on the procedure exactly 😀

irfx June 23, 2016 - 8:53 pm

I cant see BOOTSTRAP with FAT 32. i see just 4 drives listed which are in MY computer.. plz reply what i do now.

irfx June 23, 2016 - 9:21 pm

Actually i deleted this partition(of 100 MB fat 32) mistakenly.. now how to do ?

Kino July 23, 2016 - 7:42 pm

This works! Thank you i appreciate it. For all who get the failure when initializing library system volume eroor. Just try the next FAT32 volume. I got that error at first. I tried the next FAT32 drive and it worked. Trust me. I was frustrated too, until i found the blog. Thank again.

zaina July 29, 2016 - 2:22 am

hi for me I have the same problem :
the boot configuration data for your pc is missing or contain errors
file: \EFI\Microsoft\Boot\BCD
Error code:0xc000000f

But with windows 10 and I tried both solution create a backup and create new one it doesn’t work
plz help help!!!!

Anthony sessions September 22, 2016 - 2:40 am

Same problem. Please someone save me exams are coming up and I’m broke.
“the boot configuration data for your pc is missing or contain errors
file: \EFI\Microsoft\Boot\BCDError code:0xc000000f”

weik October 7, 2016 - 5:48 am

Great, you save my day! Thanks

Luke October 11, 2016 - 10:52 am

Thanks a lot!! Weeks of work saved from reinstall!!!
Dio canaglia!

T October 20, 2016 - 12:39 pm

Used this solution after removing Ubuntu. The only solution that worked. Papa bless.

Loodusemees November 1, 2016 - 1:51 pm

Thanks a lot! You really made my day! Advice worked well with my Windows 10.

انس الهلالي November 6, 2016 - 1:27 pm

I cant see BOOTSTRAP with FAT 32. i see just 4 drives listed which are in MY computer.. plz reply what i do now.

sura December 14, 2016 - 4:10 pm

Thanks a lot!
All my good-wishes to you.
For those who get error messaage in last step BFSVC Error : Can not open the BCD template store. status – [c000000f]
Please try with ” bcdboot c:\Windows /l en-uk /s v: /f ALL ” command. Please note that you have to try with both forward and backward slash before Windows and your own local language code instead of en-US.

For me the following last command worked
bcdboot c:\Windows /l en-uk /s v: /f ALL

Thank You again. Thanks a lot!!

pailhead August 2, 2017 - 2:18 am

still cant get past c000000f

Robert December 18, 2016 - 7:44 pm

Thanks for your help. I was getting no where with trying to fix the boot issues with this server. The boot info was corrupted or just not readable. No matter what i did nothing worked until i tried your steps. yours worked on the first try.

Stephan February 12, 2017 - 12:46 pm

Thanks a lot for the excellent description – it worked fine on my Windows 10.

Alfa February 25, 2017 - 5:47 pm

Excelente solución. También funciona para Windows 10. Muchas gracias.

Caio Foreman March 14, 2017 - 6:01 pm

did everything, now I boot into another error. fie/efi/microsoft/boot/bcd error 0xc000000f and I can only boot into bios. I tried to boot from windows boot manager but it doesnt work

Gunman September 14, 2017 - 1:56 am

Just follow the steps and BOOM everything work well in my Windows 8.1…Thanks a lot.

jON December 8, 2017 - 10:20 am

Great Article

Helped me

Thanks

Gene Edwards March 2, 2018 - 1:33 am

Great article!!!

I was doing a Recovery when my laptop shut down, I forgot to plug the charger back in.

Now I am getting:
The BCD for my pc is missing or contains errors.

File: \EFI\Microsoft\Boot\BCD
Error code: 0xc000000f

Windows 8.1 was pre installed on my HP Envey, so I don’t have a Installation disk, plus I never got around to making a Recovery Image.

I’ve successfully assigned the letter (k:) to the system partition, I have tried entering
cd /d K:\EFI\Microsoft\Boot\
cd /d K:\Boot\
cd /d K:\ESD\Windows\EFI\Microsoft\Boot\

Every time I get “The system cannot find the path specified”

How can I fix this?

Thanks

Max March 2, 2018 - 12:50 pm

Show me the contents of your system partition using the command:
dir k:\

Frankd3 March 8, 2018 - 2:15 pm

ASUS Q400 Laptop
Windows Version 8.1
What happened.. 2 days ago I was switching my antivirus protection, and was asked for reboot in order to complete process, and that’s when the BSOD came in, for the past 2 days I have scoured the interwebs for help on this. I have made a iso DVD boot disk and a USB boot disk as well.
When I boot my computer normally it says—- Recovery Your PC needs to be repaired File:\WINDOWS\system32\\drivers\ACPI.sys Error Code 0xc000000f
When I boot from the usb iso file and attempt to Refresh your PC it stated that —The drive where windows is installed is locked. Unlock and try again
I have ran chkdsk from the command prompt and there seems to be no errors.
Please any help world be appreciated, trying to get my computer back up and going without having to wipe all my personal data..
**no restore point were ever created on this computer.
Thanks

Update**
Diskpart
List vol
Volume 0 D ESD-ISO UDF DVD-Rom 3368 MB Healthy
Volume 1 C OS NTFS Partition 677 GB Healthy
Volume 2 SYSTEM Fat32 Partition 300 MB Healthy Hidden
Volume 3 Recovery NTFS Partition 600 MB Healthy Hidden
Volume 4 Restore NTFS Partition 20 GB Healthy Hidden

Update***
bootrec /rebuildbcd
Successfully Scanned windows Installations.
[1] C:\Windows
Add installation to Boot List? Yes/No/ALL:Y
The requested system device cannot be found.
x:\Sources>

Update *** NEW ERROR** Set the correct Partition… Tried and failed apperently
did the following
diskpart
sel disk 0
list vol
sel vol 2
assign letter f:
cd /d f:\EFI|Microsoft\Boot
bootrec /fixboot
ren BCD BCD.Backup
bcdboot c:\windows /1 en-us /s f: /f ALL
Restarted Computed wo boot disk and now Error shows
file\EFI\Microsoft\Boot\BCD
error code 0xc000000f

****Update
Attempting to repair boot problem
Deleted BCD.old,BCD.temp,BCD.tmp off of c:\windows\boot (previous attempts)
did
x:sources>bootrec.exe /fixmbr
operation completed sucsessful

x:sources>d:\boot\bootsect.exe nt60/all /force ***(d is my cd/dvd drive with my boot iso)
Target volumes will be updated with BOOTMGR compatible bootcode
c: bcdedit /createstore c:\boot\bcd.tmp
the operation completed successfully

x:sources>bcdedit.exe /store c:\boot\bcd.tmp /create {bootmgr} /d “windows Boot Manager”
The Entry {bootmgr} was successfully created.

x:sources>bcdedit.exe /import c:\boot\bcd.tmp
The store import operation has failed.
The Requested system device cannot be found. *********This is where I am… any help thanks

Frankd3 March 8, 2018 - 2:38 pm

Im on day 4 right now I just bought a 2tb HD to xcopy all my data from my c: drive incase I screw my computer up further. Im a complete novice to CMD.exe and understand maybe a fifth of what im doing.. I have no idea if my system is uefi or what.. I know there is a boot option on my bios screen that shows my dvd drive as uefi and when I boot from it, it takes me right back to my bios screen and I have to choose to boot from my other option witch is my dvd drive again without the uefi part on the listing. and that one allows the recovery disk to open and im in the windows repair my computer part.. At this point I have posted this on 5 different forums and zero replys to the posting ugh… I have watched countless youtube videos on this and im just not understanding what is missing … kinda in the dark at the moment. I need to solve this already I don’t not want to give up and do a fresh install I have already invested 4 days and its a matter of pride lol… this will not beat me…

Pepe Gotera March 24, 2018 - 9:00 pm

Thank you very much, this save my life …

Roger Vince March 30, 2018 - 1:21 pm

Thank you very much.

I spent three entire days trying to restore BCD on a windows 10 UEFI system after I accidentally formatted the boot partition. Then I found this site – problem fixed. I also had the “Failure when attempting to copy boot files”. This was because I had the wrong drive letter for the Windows dive. If you have several hard disks ensure that the Windows drive is set to c:
When in Diskpart
Diskpart: list vol
identify the windows partition (not the FAT32 Sytem Partition) and select –
Diskpart: sel vol x (x is the Windows partition)

Now bcdboot c:\Windows /l en-uk /s K: /f ALL should work – it did for me.

Now assign c: to the Windows partition
Diskpart: assign letter=c

Roger Vince April 25, 2018 - 9:16 am

Correction to my comment on March 30th. The bcdboot command should, of course, be last after the assign letter=c line. Sorry for any confusion.

Chris June 6, 2018 - 9:56 pm

This SAVED my life! Windows 2012 Standard Server with Hyper-V running did not want to boot after a bad Windows Update.

Thank you soooooo much!!!!

Mike June 21, 2018 - 6:52 am

MBR got corrupted and the boot partition had to be reassigned and MBR recreated.

This guide showed me how and I got the system back up and working (Windows 10).

Thank you!

Robert Befort June 22, 2018 - 11:31 pm

I have a windows 10 which will not bootup probably due to misconfigured bootloader. When I open diskpart this is the information I get:

List Disk
Status Size Free DYN GPT
Disk 0 online 465 gb 2048 kb *

List Volume
Vol. ### LTR LABEL FS TYPE SIZE STATUS INFO

Volume 0 E J_CCSA_X64F UDF DVDRom 3830 mb healthy
Volume 1 C Windows 10 NTFS Partition 388 gb healthy
Volume 2 D NTFS Partition 75 gb healthy
Volume 3 WINRE_DRV NTFS Partition 999 mb healthy Hidden
Volume 4 SYSTEM_DRV FAT32 Partition 260 mb healthy Hidden
Volume 5 NTFS Partition 488 mb healthy Hidden

I am not trying to install an updated version of windows 10. I just want to be able to boot into what I already have which is version 1511. I know it is outdated but I don’t want to make a change at this time. In the above configuration, would I have to change the letters or volume numbers so that it boots directly into system_drv? Do I even need the vol. labeled J_CCSA? Please advise. Thank you.

admin June 26, 2018 - 6:29 am

Volume 0 E J_CCSA_X64F – this is your DVD drive
You can try to repair your bootloader and BCD configuration and using this manual: http://woshub.com/how-to-rebuild-bcd-file-in-windows-10/

Trying to Convert a Windows 10 OEM Physical Installation to KVM | Ray Woodcock's Latest August 8, 2018 - 5:23 am

[…] to do in that case. Both were small: Volume 3 was 1024 MB and Volume 4 was 100 MB. A search led to a WindowsOSHub page that said the EFI volume “can easily be recognized by its size of 100 MB and FAT32 file […]

Berat August 9, 2018 - 12:46 pm

In my case when i type list disk command it just shows two disks. One is 0 byte sized disk0 and the other one is 8 gb sized usb. Is my harddisk broken?

admin August 13, 2018 - 9:50 am

Yes, apparently you have a problem with the disk, its controller or device driver.
Try to connect your HDD to another compute rand check if it is recognized.

abrise September 30, 2018 - 2:47 am

Thank you very much for this tutorial, it really has saved me after I broke the root of my surface pro 4 2017 when trying to getting rid of Phoenix os who has left behind root problems after uninstallation. Sartup automatic repair didn’t fix anything.
In my case
1 boot volume was volume 2 and is now still fat32 but over 300mb
2 I was very embarassed to see that command bootrec /fixboot didn’t work. Returning something like it couldn’t write. I decided to go on whith the procedure anyway and eventually recovered the Windows Boot Manager option.

JW December 31, 2018 - 3:57 pm

Finally! Using bcdboot as described from the built-in Recovery command prompt kept resulting in “Failure when attempting to copy boot files”. But using the same bcdboot from the Repair option of the Windows installation media WORKED!
BTW, isn’t mountvol k: /s a much easier way for mounting? (if that works)

michele March 28, 2019 - 4:25 pm

Recreate the boot sector on the boot partition

1 bootrec /fixboot
error: ACCESSO NEGATO

michele March 29, 2019 - 4:07 pm

why this?

Kunal June 1, 2019 - 4:44 pm

Thanks for this article.

In the last step when I try to use

bootrec /rebuildbcd

It identified the windows installation.

But when I say yes to ‘Add installation to boot list’

It fails saying ‘The requested system device cannot be found’

Thank you!

Sjjs June 11, 2019 - 11:34 pm

Thx a lot this worked

unni September 22, 2019 - 8:07 am

Havent been to H/W for very long and while moving my OS to SSD and then cleaning up my HDD i messed it up. Was quite confused about the solutions provided and i was getting errors because I was looking at wrong partitions. Never knew there is something called EFI partition too. This article helped a lot and find the exact partition which i should work with when all other articles didnt mention about EFI and how to find them in the Volume. Thanks a lot it worked after I ran bootrec /rebuildbcd on the EFI partition selecting the folder of EFI.

JULIANO GARCIA DA COSTA September 26, 2019 - 5:26 am

Perfeito , maravilha!!!

arthur brogard December 3, 2019 - 2:27 am

I have list disk: 0: 931Gb free 104kb
1: 3827 MB 960 kb * – that’d be kyhi usb i’m booting from
then list vol: 0 G DVDROM
1 C sys reserved NTFS Partition 500 MB
2 E NTFS Partition 930 GB
3 F NTFS Partition 467 MB Hidden
4 D FAT Removable 3825MB – this would be the usb
So no Fat 32 100MB EFI Volume and everything already labelled.
So what must I do?

michele December 23, 2019 - 2:15 pm

arrived at this step:
Recreate the boot sector on the boot partition

1 bootrec /fixboot
error: ACCESSO NEGATO
why this? any idea?
thanks

admin January 15, 2020 - 9:31 am

Just skip this step and move forward.

How to Repair Broken EFI Bootloader in Windows 10, 8.1

The boot configuration data for your PC is missing: EFI\Microsoft\Boot\BCD

Automatic Windows Bootloader Recovery

Manually restoring the Windows 10/ 8 bootloader using the installation media

How to Allow Multiple RDP Sessions in Windows 10

FAQ: MS Office 2013 KMS and Volume License Activation

Related Reading

106 comments

Leave a Comment Cancel Reply