Check HP's website to see. However, this is something you should have thought about and taken care of BEFORE you wiped out a perfectly good working OS.
If HP's website doesn't have anything, then you're screwed, and you'll either have to go back to Vista or possibly 7, or live with XP as-is.
Next time, plan ahead a little.
I have recently downgraded my compaq presario c700 from vista to xp. The OS is working fine but need drivers that came pre-installed for graphics and sound. I also no longer have wireless connectivity with this unit. Is there a download pack available?