Windows 7 failed to boot after BIOS adjustment

I'm currently running a WD 500g with Windows 7 Ultimate x64 and a Seagate 250g with Windows XP Home Edition. I recently changed my BIOS boot order from the WD to the Seagate to see if I could still run XP. Turns out I can. My problem is that now I can't load Windows 7 back up on the other hard disk.

Bear in mind that I have no other OS' loaded on any other partitions, and these HDDs are separate. The Seagate is IDE and the WD is Sata.

I can load perfectly fine if I set the Seagate to load, but I get the infamous "Bootmgr is missing, Press Ctrl Alt Delete to restart" error msg when I try to boot win7.

I'm running a custom PC with a Gigabyte GA-X58A-UD3R mobo
nVidia GeForce GTS450
Seagate 250g Windows XP
Western Digital 500g Windows 7
6g RAM
i7 940 processor

Anything other than that I don't think is relevant.
I am getting frustrated, so any help is appreciated. Thank you.

P.S. I have the OEM Windows 7, so no disk available.
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More about windows failed boot bios adjustment
  1. This is what i would do

    Try removing the hard drive that boots and set your bios to the correct order along with any pin settings.

    Secondly was windows xp always installed on that system or did you move that hard drive from a different build?
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