Heh, be sure is Comodo.
Repairing windows, restarting services and many other things didn't fix it for me. I fixed it by using a repair utility of Comodo and enabling traffic. I ended up with a format and fresh install, after loosing almost 2 days to figure it out. Comodo is very nasty to remove, their forum is full of removing/uninstalling problems.
Check this out :
http://forums.comodo.com/help_for_comodo_antivirus/manual_steps_to_uninstall_comodo_antivirus-t887.0.html