Originally Posted by Steel_Wind 
Playing ME PC on my 3.3 GHz Core 2 Duo with a nVidia GTX260 is nigh impossible. The driver issues with nVidia displays are significant and large. Many people can't even play the game here guys. DLC is not the issue when your game is outright defective.
I understand that many people can play and enjoyed ME for the PC. It stutters so much on my system I can't even really play it. If I want to play ME - I'm stuck playing it on my 360 (which sounds like a leafblower under my TV when it is on from the twin 70 cooling fans, but that's another thread).
Try the omega drivers. With them my FPS rised from 5-20 to 40-50. The game run totally smooth. My pc at the time was 2,7 Ghz core2duo and old 8800GTS640.