spoilmya Please remove your Mods folder and test again. You don't need to save your progress, but it's important to find out whether mods are contributing to the issue.
If that doesn't help, please try loading a new save, for comparison's sake, the next question being whether the problem is limited to the one save or is more general.
If the new save crashes, please provide a dxdiag. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.