Just to pitch in some bullcrap; I reinstalled my Compaq machine the other day. It is an SP 1 install because it had a F10 function to restore the system. Now, the system tells me that it is not a valid copy of XP, and windows is trying to force me buy another license. I refuse to do this because my copy should still be valid. I was not told that I may or may not have a limited amount of restores. They told me anytime I needed to do so, hit that F10 at bootup. Well, now I can't do either. I have to put up with this thing nagging me all the time to buy another license.