Have you still got your XP CD??
While BIOS is booting, press set-up (It is only displayed for a few seconds) and it'll either be F8, F12, Del or something line that. Change the boot drive to CD ROM (this way it doesn't have to be a live CD) and it should come up with XP set-up. Tell it to repair, get ya files back then use Linux or whatever OS you want and format ya HDD.
03/06/2008
Boom Blox
Sydney, NSW. Hills District