Windows 10 bootrec /fixboot access is denied

Windows 10 Installation Media:

1. Insert the Media (DVD/USB) in your PC and restart.
2. Boot from the media.
3. Select Repair Your Computer.

Select Troubleshoot.

1. Choose Command Prompt from the menu:

Type in the command:

Diskpart

Type in the command:

List disk            (Note which disk is your Boot drive number mine is 0)

Type in the command:

Sel disk 0

Type in the command:

List vol               (Note which volume is the EFI partition mine is 4)

Type in the command:

Sel vol 4

Type in the command:

assign letter=V:

Type in the command:

Exit

Type in the command:

V:

After you have assigned a drive letter Using Diskpart You can format the EFI partition:

Example: if you assigned a letter V to the partition the command would be:

format V: /FS:FAT32

After the format you need to recreate the EFI directory structure with the command:

MD \EFI\Microsoft\Boot

Then change to the Boot directory with:

~~cd /d V:\EFI\Microsoft\Boot~~

Then run:

bootrec /FixBoot

Finally run:

bcdboot c:\Windows /l en-us /s V: /f All

Type in the command:

bcdboot C:\windows /s V: /f UEFI      (This replaces the above crossed out lines and works in Win 10 1709)

I had the same issue with the command Bootrec /Fixboot "Access is denied",

This only happens with Windows 10 1709 install media.

I tried the same command  with Windows 10 1703 install media and do not get the error "Access is denied".

This looks like an error with the install media for Windows 10 1709

Regards

Mark

Thanks everyone. I found out how to fix it. My laptop is back in business.

First of all I found the drive has a hidden 100MB Fat32 EFI boot partition, something new to me since I haven't been keeping up with current tech. The Windows automatic repair program can't see it so it can't repair it either. What you have to do is use diskpart to give the partition a drive letter and go on from there using command prompt (although I guess it's possible that auto repair might be able to fix it once it's made visible).

The instructions I used were these from Dell, but there are others on the web too. They seemed to work fine for my Acer though.

Good luck!

Windows 10

If you do have the Installation Media :

1. Insert the Media (DVD/USB) in your PC and restart.
2. Boot from the media.
3. Select Repair Your Computer.
4. Select Troubleshoot.
5. Select Advanced Options.
6. Choose Command Prompt from the menu :
   1. Type and run the command :

diskpart 2. Type and run the command :

sel disk 0 3. Type and run the command :

list vol

1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it :
   1. Type and run the command :

sel vol <number of volume> 2. Type and run the command :

assign letter=<drive letter>: 3. Type and run the command :

exit

1. In order to repair the boot record :
   1. Type and run the command :

cd /d <drive letter>:\EFI\Microsoft\Boot
2. Type and run the command :

bootrec /FixBoot

The next step is the same across all the operating systems at this point :

1. Rebuild the BCD store
2. First run the command below to backup the old BCD :

ren BCD BCD.old 3. Now recreate it using this command :

bcdboot c:\Windows /l en-us /s <boot letter>: All