I have a PIV 3,2 GHZ (LGA775), 2GB RAM DDR400 and a 7600GT 256MB AGP Graphic card. My CPU is a bit more powerfull than your CPU, i have less RAM than you and my VGA is a bit less powerfull. Maybe the problem is the DDR frequecy (333) of your RAM and your programs running in the background (like antivirus, firewalls, etc...)
I run the game perfectly with the default mods activated.
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