REINSTALLED WINDOWS BUT CAN'T GET COMMODO BACK............

Hi can anyone help me out ,i have just reinstalled windows and tried to install commodo firewall but when i try to get the set up of commodo going it says do you want to uninstall commodo if i click yes nothing happens ,if i click no nothing happens …i can’t find commodo anywhere on my system but yet i can’t install it cause it thinks it is on my computer any ideas please :THNK