Win7 Rebuild BCD

Failure to boot triggers Startup Repair - OS not found

When Windows 7 and later fail to boot, it may be necessary to rebuild the BCD files and structure.  From a recovery console CLI.

Due to the low level nature of this repair, it is strongly recommended that a disk image (backup) is taken before commencement.

1. Backup the existing BCD

Bootrec.exe bcdedit /export C:\BCD_Backup

2. Unhide and disable the existing BCD

cd \boot

attrib bcd -s -h -r

ren c:\boot\bcd bcd.old

3. Rebuild the BCD

bootrec /RebuildBcd

bootrec /fixmbr

bootrec /fixboot

4. Optional.  The partition can be marked active, if needed, using the diskpart utility

diskpart

list disk

select disk 0

list paritition

Warning! Beware of recovery partitions

select partition 1

active