Since you're getting this error with games other than Civ5, you probably have a problem with your system. You may want to open your case (assuming you have a desktop, not a laptop), blow out any dust and make sure that all the fans are spinning (including the fan for the video card, if it has one). Make sure that all the interior cables are tightly connected. Reseat the video card and any other internal cards. If none of these suggestions make sense, perhaps you have a friend who can help. If none of this helps, you should check your RAM for errors. Please post again if you would like a better explanation or need more advice.