Uninstall of Comodo Firewall

My Son tried uninstalling your original Firewall, to replace it with Comodo Internet Security, but the old one didn’t uninstall properly. He still tried installing CIS, but it don’t seem to work right either. Is there some way of getting rid of any instances of Comodo Firewall completely. He thought he would be better off with CIS, and getting rid of his other similar programs.

This should remove any remnants.