I have a cpu, 256 mb of video (GForce FX), Pentium 4 3.1ghz, 1GB RAM, and the game in 640 * 480 runs high as well, but when you upload to 1024 * 768, the game runs jumps, and fix this? will increase RAM? 2 gigas be fine?

u try downgrading Graphic Card Driver. :clapwap:

u try downgrading graphic card driver. :clapwap:

+1

close ur anti virus when you play its a resource hogs & eats up memory.
more memory is always a plus tho.