How do I fix a Bad_Pool_Caller?

When I updated from XPHome to XP Pro, it installed half of Pro and is now in a loop on the blue screen. If I restart it come right back up to "insert the disc" and then stops at the same spot, Bakc at the blue screen. Any help of how to get out of this loop so I can take off or fix XP Pro?
Justin Orrick, May 2004
Probably a bad XP disc
if not then u need to update ur BIOS

monster9994, June 2006
Rip out any Zip drives you may have.

eniparadoxgma, December 2004