Lainaus:

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I have done this numerous times and it always worked for me.

To change System partition ( if it is on the same HD as existing System
partition):

To change it to C:

1. Copy and paste bootmgr and pale yellow boot folder from existing
system partition to C:

(You get a message bcd is in use and can't be copied - skip it and copy
the rest.)

2. Open an elevated cmd and type :

bcdedit /export C:\Boot\bcd {enter}

3. In Disk Management , mark C Active. Reboot to hand system status to
C.

That's it.

Afaik it doesn't matter where bcd declares bootmgr is - the bootsector
code on the Active partition does not parse the bcd store - it will
always hand control to bootmgr on that same Active partition.

If you wish to change it for completeness:

bcdedit /set {bootmgr} device partition=C:

Hope it helps

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