Your video card might make your system get to hot and then it freaks out, or maybe you need to get the updated catalyst drivers. It could be something with your RAM conflicting with the system settings, because I had a friend that has 256mb of RAM and he has to take out 128 of it to use Adobe Photoshop, because when it is in it freezes. Have you added any RAM recently??? It could possibly be something with your OpenGL support.