Buy a new code for your copy of XP. You can get them from Microsoft. (Better yet, buy a new computer, get the info from that, then return it.
) NO crap, that happened to my neighbor, bought a brand new computer from Best Buy, took it home, set it up, and when he was prompted to register XP, it told him that his registration number was invalid. Then he found a disk in the CDRom drive. Took it apart, boxed it up, and returned it to Best Buy. When they tried to charge him their customary restocking fee, he told them to go to hell that they had sold him a used computer. He proved it too. The inside of the case was filled with dust. They gave him his money back and he ordered a Dell. (shudder). But he is very happy with it.