So clearing the CMOS will allow me to boot into XP?
Clearing the CMOS put the BIOS settings back to default, it doesn't mean that it'll boot directly into Windows.
I would type hitting F8 before Windows starts boots and go into Safe Mode and see if it still restarts. This way you can see if there's something wrong with your installation and update drivers and such to fix it.
If it still reboots while trying to go into safe mode I would run try a system repair using the XP Install Disc.