Hello,
my pc started to act weird, my Firewall couldn’t turn on and I tried to reinstall Avast but now i cant because it says “The Base Filtering Engine (BFE) is not running”.
What to do, I want to start Avast boot-scaning but cant install it at all.
Hope I’ll get answer soon, thanks. :-\
Welcome to the forum. 
Please follow the procedures outlined here:
https://forum.avast.com/index.php?topic=53253.msg451454#msg451454
Once you’ve attached the requested logs, I’ll notify a Malware Removal Expert for you.