I know it is probably my fault for not checking everything before I finalised the purchase of our second-hand pc but not everyone is clued up with these things! I cannot locate the seller so that is a dead end. I wonder, considering that Microsoft is an enormous company with more than one intelligent computer whizz working there, why they can't over-ride whatever is blocking my XP product key from showing up, as I have no proof except that the program is in my pc? It is annoying me to the max that I cannot upgrade anything due to the product key being blocked for some reason. Please help the innocent.