Heh, a lot of these problems seem similar to what I had around revision 1200. Slow frame rate, giant black textures, etc. Basically just try a few different revisions of the game from the extremulation website. Nothing I can do to upgrade because I have a laptop, but i do have 3.2 gightz, 3 gigs of ram, and a an nvidia 8600 graphics card. But I did get mine to work full speed perfectly on the newest revision. So just try some other revisions, thats all you can do. Or get a new computer.