Never, ever, trust a computer geek to make your machine the way you want it. The only method is to geek yourself
A nice experiment but a pain to live with. Especially for a gamer. Fancy having free linux but paying for wine... it's just odd!
Quite correct though. 32 bit can address almost 4Gb but then take off your graphics memory off that number and that's how much it can actually address.
Seriously though, Avast or MSE and a decent spyware scanner will do the job like Spybot.