I have tried to install the windows XP service pack 1 and I got an error message saying that the product key I used on installation was not valid. Is there a way to get this update working? Naturally I did not buy the windows XP copy. I have the same problem with office update. Every time it tries to update office XP it stops with an error and I have found out that the versions of all .exe files are 10.0.0 which according to microsoft is not supported version. Whatever that means. Some help please since I know there are millions out there with copies of windows XP