1
The AMD Radeon HD 8600 card is very old from 2013, it does not support DirectX 12, what game(s) are you experiencing problems with on that card.
2
The best option is to completely remove the current AMD graphics driver using the widely available free DDU utility, then restart your PC and go to the AMD website to download and install a couple of slightly older versions of the AMD graphics driver to try to find a version that is stable on your system.