Welcome to owning an ATI/AMD video card.
So long as you've installed the proper version for your operating system (Windows) you should have the right drivers. I never use the drivers released on the manufacturer's site as they're always out of date.
However, if the latest ATI driver doesn't work for you I'd suggest downloading the next older driver to see if that works. Do so until you get on that's stable. Later, if/when ATI releases a newer version you can try that to see if it fixes your earlier problem.