Unable to reinstall firewall

Had been using Comodo firewall, but had to re-install entire hard drive from my backup. Unintentially reinstalled Comodo from backup disk, but program would not work. Comodo not listed in add/remove list of control panel, so deleted Comodo from Program Files. When I tried replacing from my downloaded file in my download list, I kept getting a message that Comodo already existed in my PC, and was asked if I wanted to remove it. I Clicked yes, but nothing happened, and was still unable to install a new copy. What do I have to do to totally remove Comodo and then reinstall it>

Hi Gerald.

Its likely you have traces of the old installation still resident in the registry. Open regedit and go to: