Sorry to hear this. I looked at your system info via Free-DC. System info notes ATI Driver version 1.4.1741. That number correlates to Catalyst 12.6 Beta. I would suggest uninstalling the Beta driver and install 12.6 certified (Here)
If you prefer the latest driver, version 13.1 x64, it can be DL'd (Here)
Or any of the older x64 versions can be had (Here)
I would recommend running Driver Sweeper 3.2.0 (Link) after uninstalling old drivers. And for added insurance run CCleaner (Link) after Driver Sweeper.