I thought I would post up my method of uninstalling ATI/AMD video drivers, I have found it works very well and maybe you could try it if the Cat install manager doesn't do what you think it should do. I have Win 7 x64 and install my drivers to the OS on C:\ so you may have to adapt to your OS a little bit... Step1. Uninstall ALL ATI/AMD software using CCC install manager, then remove the install manager itself from Control Panel\Programs and features Step2. Delete ALL folders named ATI/AMD in C:\ C:\Program Files C:\Program Files (x86) C:\ProgramData C:\Users\"username"\AppData\Local Step3. Using device manager, uninstall (if any) ATI/AMD devices shown in Display adapters (including software if asked) Step4. (The longest bit) hit win+R and type regedit navigate to the following:- - HKEY_CURRENT_USER\SOFTWARE\ delete ALL ATI/AMD folders - HKEY_CURRENT_USER\SOFTWARE\Wow6432Node\ delete ALL ATI/AMD folders - HKEY_LOCAL_MACHINE\SOFTWARE\ delete ALL ATI/AMD folders - HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ delete ALL ATI/AMD folders - HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\ Delete all keys (those that cannot be deleted will show an error) Step5. Reboot, you system should now be clear of any previous ATI/AMD drivers takes less than 5 minutes, hope the guide can help. Steve [EDIT] IF when you reboot in step 5, your system just shows either a) a black screen or b) the windows boot up GUI when you should be on the desktop, then you need to restart in SAFE MODE, once in SAFE MODE and at the desktop, do the following:- in device manager, delete any hardware that is shown (including software) from Display adapters, reboot and should then be good to go.