Read this thread with a great amount of interest - just finished setting up my laptop after a complete nuke and re-install. Symptoms were the same-ish, could connect to network (wired or wireless), get an IP address, then nothing. Couldn't even log into router. Phorm.com had been blocked for several weeks. After shutting down all programs like Comodo, Spybot, and AVG problem still remained.
As other machine on network (not running Comodo) worked fine
, assumed it was a tcp/ip error. After an attempted repair using a borrowed disc failed, bit the bullet and used the recovery partition, and all now is fine. I eliminated the firewall as the problem remained after I had shut down the firewall... Is it possible that Comodo was still having an effect after being shutdown, or started in safe mode? Just interested as it all adds to my knowledge...