A friend was given a computer with XP, through a recycling list. It has the MS Certificate of Authenticity sticker, with the Product Key, on the bottom. It seems to me she intended to give him the XP license also, and he can use that number if, for example, he wants to upgrade an old computer or assemble a new computer. Do you agree? OTOH, I was given a computer, an eMachine, but without the harddrive, and it too has the XP C of A sticker on the bottom with the Product Key, but my guess is he didn't intend to give me the license, because he kept the harddrive. Do you agree? (He was moving and that's why he gave his old junk away, and that's also why I can't reach him.) OT3H, in a few years, when most people have changed to Vista and 7, there will be loads of licenses around that no one wants, isn't that likely? Or at least that no one uses. Will they be selling them? If I try to use that license years from now, will it warn me it's still in use without screwing up the guy who was nice enough to give me the computer? Or should I try to track him down now? Thanks a lot.