- Restart your computer and boot from the installation disk
- Click Repair your computer, then Troubleshoot, and then Command Prompt
- Type these commands in Command Prompt:
diskpart
sel disk 0
list vol
- The EFI partition is formatted under the FAT32 system. Check for the volume item that has "FAT32" in the "Fs" column.
- If the volume number of EFI partition is "1", type the following command:
sel vol 1
- Assign a letter to this partition, one that is not available, for example
x:\
. Type this command to assign the letter:
assign letter=x:
- When the success message appears ("DiskPart successfully assigned the drive letter or mount point."), type
exit
to quit the DiskPart utility
- Type the next command, but remember to replace
x:
with the partition's letter you chose earlier:
cd /d x:\EFI\Microsoft\Boot\
- Type the bootrec command:
bootrec /fixboot
- Backup the old BCD with this command:
ren BCD BCD.backup
- Recreate the BCD, but remember to replace
x:
with the partition's letter you chose earlier:
bcdboot c:\Windows /l en-us /s x: /f ALL
- Type
exit
and remove your installation disk from the disk tray
- Restart your computer