I agree.
I just listed the possibilities but in your case (OP), you are probably golden, no need to worry.

Hallo,

The only thing you could get is a broken driver (after an update, had that with logitech) that can cause some problems.
The other thing is that if somebody physical tempered with your...

Hallo,

what about uBlocker?
Shouldn't uBlocker also protect against that?

Hallo!

Why don't you try to install Kaspersky AV (the 30-days trial) as a test.
Kaspersky should disable all configs of old AV and maybe reset some of the broken settings.
Use Kaspersky for a...