Res could be the problem , i just couldn't have more than 1024X768 or its laggin me off.If opengl dont work, try direct3d, less good, but a lot better than software ...Originally posted by AudioSlave
i had the exact problem when i was running in software mode, check again that you are in open gl, and maybe drop your res a little, not too sure it the res bit will help but the open GL is a must!