Quote Originally Posted by onewingedangel View Post
I'm having real issues getting CAT 8.6 to work (running vista 64 bit with a HD3870) - I keep getting the error message "No Ati graphics driver is installed, or the ATI driver is not functioning properly. Please install the ATI driver appropriate for your Ati hardware". Clean install, install over 8.5, installing just the display driver - all with no luck.

CAT 8.5 runs without problem, so theres something specific to the 8.6 install messing up.
Try installing the driver manually via updating the display driver in Device Manager and point the wizzard to the C:/ATI (default folder for Ctas package extraction) - usually works

you cannot only install driver, you must install 8.6 CCC as well
not necessary