First thing I recommend to do it's uninstall the current video driver and browse the nvidia site to find the latest driver to your video card. I have ATI card but I think nvidia has also done some drivers to Win7.Now, just because you have an hig-end computer that doesn't mean you'll get 100FPS. There are several things that influence the fps in games. For example, make sure you have your hard drive defragmented and as clean as possible.I also think you should make some tweaks in your fs. Browse the internet and you'll find a lot of topics about that, just try several and use the best options for you and your system.