Ok im pretty sure my bottleneck when playing games is the processor, but what do you guys think i should uprade to get better performance in games.

Specs:
Windows XP Service Pack 2
Asus A8N-E 939 socket (nForce 4) motherboard - has dual processor capability
AMD Athlon XP 3000+ (running at 1.81 GHz)
1 GB DDR PC3200 RAM
Nvidia 7600GT 256MB
onboard Realtek AC97 audio




Should I get a completley new motherboard and processor. a different processor, another (2) processor?

im confused, not good with hardware stuff and i feel that the local computer store overprices stuff.