[Petrah]

Without seeing info from your DXDiag, I don't know what else we can suggest. Although if you want us to have a look to see if we can make other suggestions, then feel free to post the following info for us.

Go to Start -> Run -> type dxdiag and press Enter. (Windows Vista: Press the Windows Key (the key with the Windows logo on your keyboard) + R (at the same time). Type in DXDIAG and press Enter or click 'OK', this will open the DirectX diagnostic tool.) Click on the button that says Save All Information. Save the file to your desktop and name it DxDiag.txt. Open the text file with notepad and copy/paste the info from only the two headings: Everything under System Information, and everything under Display Device up to and including Driver Date/Size.