bootrec fixboot - access is denied (GPT disks)

Added: 1/24/2019 7:00 PM

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If your Windows won't boot because you messed up the EFI boot partition, and you get "Access is denied" when trying to run bootrec /fixboot from a Windows Install DVD, here is how to manually repair the EFI partition: 1) Boot from your Windows 10 Installation Media 2) Select Repair Your Computer. 3) Select Troubleshoot. 4) Choose Command Prompt from the menu 5) Type in the command: diskpart 6) Type in the command: list disk 7) Note which disk number is your boot drive (usually 0) 8) Type in the command: select disk 0 (or whatever your disk number is) 9) Type in the command: list volume 10) Note which volume is the EFI partition. It's probably 100MB and FAT32. 11) Type in the command: select volume 3 (or whatever its volume number is) 12) Type in the command: assign letter=V 13) Type in the command: exit 14) Now that you have assigned a drive letter to the partition, you can format that EFI partition to wipe it out so it can be recreated from scratch. 15) Type in the command: format V: /FS:FAT32 16) Now the EFI partition is blank so you must recreate it. 17) Type in the command: bcdboot c:\windows /s V: /f UEFI Now, you can reboot the computer and it should load Windows correctly.