Cheers for the thread fix-up. I had already performed a clean install but tried the installation guide posted for arguments sake. Before reinstalling the driver I tested the internet browser which worked well and my mouse pointer didn't jitter in the corner of the screen. No game exe's opened though and windows aero is not fixed. I have reinstalled the 11.4 AMD drivers and now the internet browser works and games will open and run. BUT, aero is not fixed, the mouse still jitters and the overall performance of teh computer is slower.