Sorry, I have entered from the Russian site and used Russian because of that ;-)
After a regular program update last night and reboot of my computer, I was notified that my computer is not safe because the firewall is disabled.
Trying to turn it on I get a message "Firewall unavailable!"
Internal AVAST "Solve the problem" worked without error notification, but didn't improve the situation.
I have found on the forum an advice to reinstall the program.
Simple re-installation and restart did not help, even after multiple attempts.
I have used both online and offline installers - no difference.
Do I need to completely delete AVAST at first using the avastclear utility before AVAST reinstall?
Unfortunately, I did not understand how to attach screenshots :-(