64MEg of RAm?
Are you running Windows? You really should upgrade to at least 128. Windows is a memory hog and if you don't have enough physical ram the Os will go to the swapfile constantly. And that slows your system, especially games down considerably.
Upgrade video drivers and get more RAM
When I went from 256 to 512, my Wolfenstein loading time was cut to 1/3 of it's original time. For the video drivers, go to the device manager and check to see what kind of card you have. Then if it is indeed an Nvidia card, go to
www.nvidia.com and get the newest detonators. I bet that will fix your problem.
BTW, there are an @ssload of Gforce cards. If you have an older model such as an MX200, there is no way you will be able to play with all the game options to high. Especially with 64mb of ram. Good luck and let me know what you find out.