help needed

am new to comodo firewall (at last i got the best!),
my problem is i had to format and istall windows on my c drive, after i had installed all programes, i would not install comodo firewall, each time i try to run the setup file, am getting a message " comodo firewall already installed, do you want to uninstall it" i tried both yew and no but not able to procedd further, there is no folder in my c drive or in the other partitions and ever deleted the key in the registry but could not solve the problem, i need to use the net often so i installe dxone but i want to install comodo firewall back. i want a soultion please, but i dont want to reinstall my OS again!

Welcome at the forums (:HUG)

Take a look here,5326.0.html