I manually searched for the newes driver for my graphics card and now it works. Thank you very much for your support ^^

First of all thanks for the fast reply.
I updated my graphics driver, but that didnt help.
Then I deinstalled my blender version and did as you said with Blender 2.92. When I tried to start Blender it crashed right at the start and only showed the power shell for a very short time. It gave out an empty debug report...