I found the best solution to installing drivers for ATI is at the install point when I am configure a system for the first time. I use a minimum of ATI's packages and to be honset the most recent version Control Panel has a pretty cool interface tp select from OpenGL or Direct 3D.
My only advise is to reduce problems eliminate overhead when first configuring a system.
Still with all this wind I'm wasting it's obvious ATI doesn't have a good wrap on it's own API or 3D calculations.
Nvidia takes the cake.