kitty

I just upgraded from windows xp to windows vista ultimate. It keeps giving me
a notification saying I need to activate windows, but when I put in my
product key, it says that it's not right and I need to buy one. However, I've
already spent the 200 dollars on this upgrade to vista ultimate and would
really rather not have to spend another 200 dollars for a product key. Can
anyone PLEASE HELP?!?!?!?!?!????