This kept messing up my system that I just built. Every time I'd set my settings in Rivatuner, entry into any 3D app would cause the system to crash in an infinite loop caused by the video driver. I found the cause of this: it has to do with the Vsync setting inside Rivatuner. When you set it to Always on and the set the Prerender Limit to ANYTHING but the default, which is 3, it will cause this behavior. Any 3D app after that will hard lock your computer and then crash. I tried this with numerous versions of Forceware, and it's all the same.