Hello, I have a hp pc with vista 64 ultimate. It crashed I believe from malware. The recovery disk suggested this was not the same pc and I'm a crook. I did change hd and a long time ago the MB due to video failure, but I've used recovery since then a couple times. This time I did disconnect the MB battery. HP support was glad to sell me a new one since my $2000 duo core 2 was obsolete. Funny you still can get duo core 2's. With much regret I bought a win 7 os and Wow the pc does work with no real issues. On the outside chance it fails after I activate and I can someway prove this, can win 7 be installed in new pc? Thanks in advance