CUDA acceleration problem

CUDA Acceleration only works with a few NVIDIA GPU's. Make sure you do not install any CUDA drivers. They will foul everything up very badly. You have an ATI GPU and that does not support CUDA at all.

There is one other thing to think about. CUDA acceleration only applies to Ray-traced rendering and that feature is deprecated because of changes NVIDIA made to their architecture. Adobe has not worked on any updates for that rendering engine for several versions and you should not be counting on it for your projects. Ray-traced rendering was always extremely limiting. No effects and a bunch of other unsupported features are listed when you enable that rendering engine. There are a lot better ways to Extrude and Bend layers. The C4D rendering engine is a lot faster than even CUDA accelerated rendering, and C4D Lite gives you a bunch of options that you never had with Ray-traced rendering and it renders faster. Personally, I have never used Ray-traced rendering for a job for a client because it was and is way too finicky and problematic. The only reason it is still an option is so you can open old projects that were authored with that system.