I just set up a little Acer Mini desktop PC yesterday, with Vista 64 on it.
I quickly removed McAfee and installed AVG 8.0 FREE and it installed and ran just fine.
NO Problemo! AVG is what I use on my personal PC and install for all my customers and we all stay 100% Virus FREE.
It never needs to be registered or RE-Registered like so many other programs.
I installed several other programs from Yesteryear, like Corel Wordperfect 8 which installed and ran just fine.
Cheers!
The Shadow