first of all make sure u set your CPU to its max throttle speed. (in win vista = max performance, in winxp = always on) not sure on win7 but i think should be about same as vista. and in power setting set the CPU to 100% min and 100% max. im not sure if u need to upgrade your RAM as well or not. i only get back home in december, that's when i can try the GTA IV in my 9500GT and E6300.