I got this message in Windows 7 Bootmgr is missing... Press Ctrl+Alt+Del
(You cannot boot with this problem)
I accidentally activated the secondary drive via Disk Management (it becomes the boot drive)
To recover the primary drive as the boot drive... You must have the windows 7 installation disc.. or Boot Repair CD, open a Command line and type this to set Windows 7 active again:
Go to repair and then command prompt.
Do these commands in sequence:
DISKPART
LIST DISK
SELECT DISK # (# for Windows 7 disk)
LIST PARTITION
SELECT PARTITION # (# for Windows 7 partition, or 100mb System Reserved partition if you have it)
ACTIVE
EXIT
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