It’s a good idea to make mutual exclusions with certain software, mostly firewalls and anti-viruses.

You still haven’t answered one very important question…
What other security software do you have now or ever had?
If uninstalled how was it removed?

I’m thinking along the lines of possible conflicts.
Comodo Firewall and avast have a history of working well together.
Quite a number of forum members use both quite nicely.