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After trying to install Qubes unsuccessfully I rebooted my computer and my boot entries were gone. Before I had grub and Windows Boot that I could boot on from the UEFI boot menu.

So I go to the windows command line from the installation CD and type bootrec /rebuildbcd or /scanos it says that 0 windows installations have been detected. However the windows partition is still accessible and seems fine by all means, the windows folder is still there...

Other threads on this problem refer to things to do inside C:\boot but I don't have such a folder and thoses threads are on Windows 7 or Vista so does anyone have an idea on what I have to do ? Is there an equivalent of C:\Boot for windows 10 ? How do I restore the windows 10 boot ?

ChiseledAbs
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2 Answers2

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bcdboot.exe can help creating/fixing boot files.

You boot installation/repair DVD/USB the UEFI way (eventually disable CSM so you cannot boot non UEFI media).

Boot files for EFI/UEFI are on EFI System Partition on GPT style disks. Exact path for Windows - \EFI\Microsoft\Boot (and \EFI\Boot - fallback).

Select repair and open command console:

bcdboot C:\windows /s S:

where C: drive is mapped to Windows partition and S: drive is mapped to EFI System partition (ESP).

For mapping ESP you can use diskpart.exe or mountvol.exe. With diskpart, you can see what the drive letter mappings are using list volume.

Note: keep CSM (BIOS emulation) disabled unless you have to do something special so firmware allows boot only to UEFI media or GPT disk.

Giacomo1968
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snayob
  • 4,500
0

as root edit 

/boot/grub2/grub.cfg

add this to the very end

insert this in the 40_custom section:
menuentry "Windows" {
insmod part_msdos
insmod ntfs
set root='hd0,msdos1'
chainloader +1
}
nomaam
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