I recently chose (more like forced to) update XP Home SP1 to SP2. Then the windows uninstaller wouldnt work and I tried everything to fix it. So I reinstalled XP SP1 (a disk I recieved with my computer, a legal disk). Then I went to activate it (I had done this twice before) and the MS computer said my code wasnt in their database. So I waited for the actual Customer Service rep to talk to me but no one answered. I tried this several times, the internet, over the phone and the key provided with my computer did not work. So I want to know. Can I just buy an XP Home upgrade disk to upgrade my inactive operating system or do I have to buy the 200 dollar copy, or this copy ?