I just got my laptop about three weeks ago. It had Vista Basic on it. I upgraded to Home Premium using the upgrade anytime and the dvd that came with the sytem. My question is "How can I find out what the activation number is of the upgrade? What if I have to re-install for some reason and all I have is the Home Basic dvd.How would I be able to put Home Premium back on when the dvd will ask me for the key when I try to upgrade?"