No sound, choppy web browsing, no games working on XP on my MacBook Pro

Forgive the long title but I have been trying to get Windows XP to work for days, I've searched for drivers to update, I have put the Leopard disk in and tried to get the drivers working correctly a dozen times, I have tried reinstalling windows multiple times, and still nothing. I cant play Bioshock, I cant play Half life 2, it says something about shaders, and also ZERO sound for anything. I know my brand new MacBook Pro can handle Half Life, and it's really getting to me. Also on a more important level, I need Windows working good for my school assignments...so is there anywhere I can look up to get everything going correctly? Or is there anyone there that has set it up on their MacBook Pro correctly? AND could tell me what steps they took to do it. thanks.