When you first turn the pc on, do you see a prompt to "Press XXX to restore the system"? If so, that should return the pc to the state it was shipped. Also check the HP support site for help.
http://h10025.www1.hp.com/ewfrf/wc/d...=10934&lang =en
If you do not have a restore feature you will need an OEM version or XP Pro . . you can use your product key with that.
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