What would you do with my new computer?

[ShockTroop0351]

Hi, I just purchased a new compy 286, jk. Actually I purchased this computer :

http://www.newegg.com/Product/Product.aspx?Item=N82E16883229090

I do quite a bit of gaming, both new and older games (Huge BF2 fan), and basically I would like to know what you would do as far as updating and configuring this computer as soon as you got it. All I've ever ran is windows xp 32bit and since this is my first Vista computer, I'm kinda unsure on what good updates I need to have. Thanks!