I just upgraded my processor to a Q6600 and Windows Vista started giving me some issues. Not sure what the problem was, I decided to just install Win XP on a separate drive for troubleshooting purposes. Install went fine and everything seems to be running OK but now I can't boot into my Vista partition. Here's how my drives are arranged:

SATA0: 36GB with Windows Vista
SATA1: 500GB apps/media drive (no OS)
SATA2: 80GB with Windows XP

The boot order is CD -> SATA0 -> Floppy. When I installed XP, I just chose the SATA2 drive as the install drive so I'm guessing what happened is the installer changed the boot config on the SATA0 drive so that XP boots.

Can anyone help me out and show me how I can either revert back to the original boot config so that only Vista boots, or if there is a program that will let me choose which OS I want to boot from on launch? Thanks.