Also check Device Manager " view/show hidden devices " just in case you have an Avast Firewall driver leftover in there as that would be the only reason I can think of for the standalone Comodo firewall to refuse installation.
Also check Device Manager " view/show hidden devices " just in case you have an Avast Firewall driver leftover in there as that would be the only reason I can think of for the standalone Comodo firewall to refuse installation.