XP dual boot fails

I've yet to switch to XP. This weekend, I finally decided that it was time to dual boot my win2k box with XP and test the waters more than I have already. However, after installing XP on a separate NTFS partition on my active drive, XP fails to boot entirely. It gets to the black XP boot screen with the bar at the bottom that continuously moves across and then eventually bluescreens with error code 0x0000007B, which is a invalid boot device error. I'm a bit confused, because the MBR at least seems to be working ok (it starts to boot XP) but then eventually fails. I have a couple ideas on how to fix this. But I want TWL input. thoughts?