Nfs hot pursuit lag much

im using intel pentium d 3ghz,..2gb ddr2 ram..1gb nvidia 9500gt..gigabyte 945gzm-s2 board.. i cant play nfs hot pursuit without lag even at lowest settings ..i tried all methods like disabling antvirus,tweaks in nvidia control panel ..free up ram..but still i cant play nfs hot pursuit without lag even at lowest settings..but my friend has core i3 3.1ghz,intel dh67vr board ,4gb ddr3 ram and even no graphic card ..i cannot find how he can play the game without any lag even at high settings with a onboard intel 2000graphics ..how i can play the game without lag with my pentium processor..