my rig

asus pn5esli
2 gig corsair ddr 800 ram
e6600 duo core
8800 gts 640mb

I am so sick of vista and am about ready to go back to xp I keep getting random lock ups it happens at startup sometimes.It happens when i am gaming its simply driving me nuts. I have updated windows , updated the drivers for my video card and it still does it. I heard of a patch for video cards but have been unable to find it. Can anyone help me fix this. I paid $150 dollars for this junk and dont want to waste my money