yeh use ya own key, microsoft is fully aware when it comes to keys on the net and will eventually put fixes in future updates to shut pc's down with known cracked keys. install xp with 1 of the keys you got and then run the "bluelist XPkey" keygen to get your own key and keep it to ya self! ive put detailed specs on how to do this back a few answers ago. search for XPkey and keychange both are nifty bits of software.