I have resetted the motherboard to factory defaults without success. However, the other tips sound great!

Right now I need the pc, but once I get home I’ll try to find a tool to delete the entries through windows, and if that isn’t possible I’ll just try to do it manually. If it does fix my pc, I should be able to easily regenerate them by chrooting.

Since I think factory resetting the motherboard entails opening the laptop up, which is not something I can do without some time, I should only do it in a few days.

Thanks for the tips!