Good day guys, girls and gamers. I had a problem with lagging in Windows 7 Home Premium 64 bit. The one day I was so desperate that I activated my Memory Diagnostic Tool at the startup menu. I just wanted to see if this will have an effect on the problem. Well I am astounded, my lagging has gone totally but in XP it is still present. Why is it still present in XP and not 7? I have downgraded my Nvidia drivers, no joy. FSX also seems to be faster when it loads. GRID is now lag free. I am not saying that this might work for you, but it never hurts to try. Good luck.