@FeebyWeeby This thread is pretty old, and the game has changed in the intervening years. So some of the troubleshooting has changed as well. It would help if you could describe exactly what's going on with your game, and what steps you've tried so far that haven't helped.
I'd really like to see a dxdiag on your computer. That will cover a lot of ground all at once. You can run one and attach the results to a post here.
Please also list the packs you have installed, and whether you use any mods or custom content as well. It's fine if you do, but it can make a difference, especially with CAS issues.