- Reboot.
- Press F8 repeatedly while the computer reboots.
Read More:Microsoft says:
The Advanced Boot Options screen lets you start Windows in advanced troubleshooting modes. You can access the menu by turning on your computer and pressing the F8 key before Windows starts. - When advanced boot options appears, click (or choose it with arrows and enter) Repair Your Computer.
Read More:Microsoft says:
Repair Your Computer shows a list of system recovery tools you can use to repair startup problems, run diagnostics, or restore your system. This option is available only if the tools are installed on your computer's hard disk. If you have a Windows installation disc, the system recovery tools are located on that disc.
It will ask something, like the keyboard input, maybe date & time, and so forth... - In the System recovery options window that should appear, click Command prompt.
- Using diskpart, locate the (usual) ESP in disk 1 (if it is still disk 1...) and assign it a letter: Read More:Code:
diskpart select disk 1 list volume select volume [insert the current ESP volume number] assign letter=Z exit
- Note down your windows installation letter (from the previous "list volume" command in diskpart): it could be different than C: in this environment.
- Create a backup of the current BCD file:Read More:Code:
cd /d Z:\EFI\Microsoft\Boot\ ren BCD BCD.old
- Re-create the ESP.
In the following command, you must change X: with your current windows letter (remember? Point 6!):Code:bcdboot x:\windows /s Z: /f UEFI /v
- Type exit and press enter.
It should bring you again in the System recovery options window. - Click restart
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