"same exact issue since I'e just installed a new windows"
"since then there's somthing wrong with the GPU"
was it working before or not?
anyways from
https://forums.creativecow.net/thread/2/1024705
"CS6's new 3D ray-tracer uses CUDA with select NVIDIA cards, but the Classic 3D renderer (the same renderer available in prior versions of Ae) renders only on the CPU.
One of the ways to speed up After Effects is to enable multiprocessing. This exploits multicore CPUs by essentially launching multiple copies of the After Effects Classic 3D renderer and rendering multiple frames at the same time. Each instance of the renderer requires its own RAM.
Adding system RAM so you have at least 2-4 GB per core on your computer will help you speed up your previews and renders by allowing you to make better use of all the CPU cores in your system."
based off of this information it seems like alot of the software programing for after effects is suppose to run on the cpu and not the gpu. only specific functions/conditions run on a gpu.