@Poster
windows XP has an enemy on your laptop its SATA

hehe
yea that's the bad boy that makes winxp not recognize u have a hard disk.
so installing winxp will be piece of cake if u disable SATA, but then again, HP in their "wisdom" have removed the option to disable SATA from the bios in most of their recent bios upgrades. i pray u have the option to disable SATA in your bios, if u don't u're pretty screwed.
but there's always a way around screw ups.
if u don't have the option to disable SATA u do one of two things. its either u slipstream your winXP installation disc with the intel SATA drivers or u downgrade your bios.
i prefer slipstreamin, it ain't too simple though but its a working option for me. nothing as bad as downgrading your flash and ending up with a BSOD. i use nlite for slipstreaming. just google "slipstreaming windows XP CD" u should have good results to learn how to do it.