Dual boot -- which boot files to edit?

Hi Guys, slight problem here, I have a dual boot system, a 500Gb drive with one half installed with XP professional, and the other with Windows 7.
I recently installed a new motherboad and encountered problems.
With the windows XP patition I knew the problem would be centerd around the ide driver so I replaced that and it booted ok. (obviously I had to reinstal the new drivers for the new M/board)
However when I tried with the windows 7 partition it just resets, no BSD, no error or anything. I cant boot into safe mode in any form on win7.
My questions are a) assuming the hardware has caused problems is there a way to rectify this or b) if I reinstall windows 7 ( not really a problem) is there a way to edit whichever boot file comes up so I dont have 2 x windows 7 boot options on the boot menu (just annoys the hell out of me ! lol)
thanks guys
glenn

Yes, boot from the Windows 7 DVD and perform a start up repair... That should do it