what service pack do you have installed on that CP machine? if it is less then SP3 please upgrade, comodo is not compatible with anything less then sp3
'Still getting the hang of this forum, but I have XP SP3. My installed version of COMODO Firewall is 3.24.147648.588 and it is working well. However, every attempt to install v4 uninstalls v3 and, though I can restore to get it operational again, it is lost to Control Panel's Add or Remove Program, and to Revo Uninstaller. So, if I am to clean it out completely I will have to do it manually. And there are instructions for that in this dialogue - elsewhere - which I will consult. Thanks for quick response. I am concerned that if updates cease for v3, I will be left high and dry.