Sorry for the delay. Thanks a lot for your tips! I tried both of them. First one: It says i never made a restore point, so I wasn't able to restore the settings. I thought this is normally made...

Thanks for your quick answer! I just tried it in Safe Mode several times but it always just stops at 10% and closes the window. In normal mode I can't even start it.

Hi everyone!

For a few days now I am unable to install or uninstall anything, do a anti-virus-scan, run anything as administrator, opening an .exe-file or simply opening the Task-Manager. I always...