new to gaming please help

hi there
my specs are q6600 quad core processer
xfi sound card 7.1
logitech x530 speakers
2x512mb 8600gt graphics cards in sli
4gb of corsair ram
500gb of memory
armour case ,19inch samsung moniter and a 17inch moniter
700w psu my question is do i just install games and play or do i have to download drivers for vista or anything else as most of the games i have are for xp and what is the difference between xp and vista thanks for your help

When you're in vista the first thing you have to do is install vista drivers, then you can start installing and playing games

Thats it