I have a ATI Radeon HD 5670 (640 sp version). Yesterday I updated my VGA driver from Catalyst 13.4 to Catalyst 13.6 (driver code 13.101) and Photoshop CS6 stopped detecting my VGA. Now I can't enable any GPU-related features to improve the performance anymore. When I tried running sniffer_gpu in cmd, it reported correctly but the "system info" tool in Photoshop still didn't recognize my VGA. I tried rolling back to the old driver and even tried uninstalling and reinstalling Photoshop but the problem still persisted. Please help me 
My system:
- Intel E2200
- 2GB RAM
- ATI Radeon HD 5670 640sp
- Catalyst 13.6 (13.4)
- Windows 7 pro 32 bit