Thank you, @theluthier! I’m wondering whether part of the problem could be an outdated driver. When I’m starting the program for the system settings of my GeForce GTX 1060 the program crashes after a few seconds before I can change anything:

I need to search for more informations on how to fix this isssue. The problem with updated drivers is unfortunately that they sometimes make things even worse. I’ve read so often about such problems which I’ve already experienced myself in the past but not with my current computer.