Ok here we go again
2 things...
1st... remove any modifications you have installed. Then try running it. If that didnt fix your problem go to step two.
2nd... Go to our clans website...
http://www.clangdc.com and click on the downloads section. There is a program there called "end it all" What it will do is close down all unnecessary background applications therefore freeing up the resources you need. It can also improve gaming performance (particurlarly on low end machines) for anyone else who is interested.
3rd,,, Just select play in normal mode