Just downloaded the free comodo firewall and tried to install in Vista Home Premium. I get an error saying that this operating system is not supported.
I have disabled Windows Defender and Firewall before attempting the install.
Comodo Firewall 2.4 is not supported in Vista or 64 bit versions of Windows. However there is currently a beta of Comodo Firewall 3.0 available which is compatible with Windows Vista, both 32 and 64 bit versions, so if you are interested in that you can find more information in the beta corner