I just purchased 6 new liecenses of XP pro....went to install it, and now when I try to install sp1, I get an error stating that my xp number is invalid...blah blah blah...please contact your vendor or microsoft antipriacy devision. ok, i know my license is valid, the only thing i can think of is that I incorrectly put in my code. Where can I check this on my PC/registry? tia Jim