I can answer one of your questions at least: If you just pre-ordered, you're too late to be in the beta.
An a more general advice, I'd recommend having a vanilla XP partition for games, and a whatever-else partition for everything else.
(Personally, I have a standard XP partition for gaming only, and a Ubuntu partition for everything else. Doing serious work in Windows is pain, and getting games to work in Ubuntu is more pain.)