I just unloaded Zone Alarm on an XP box after downloading the upgrade to Norton AntiVirus and learning that I could expect two days of fighting with a locked up computer if I continued without unloading ZA. When the NAV installation package said I had to unload ZA, I researched in various forums and learned that I was indeed on the edge of computer misery. One of the forums suggested Comodo. Hoorah! I’m here and nothing I have been able to find says there are conflicts between Comodo and NAV 2009. I have looked around in this forum and others that Google pointed to.
I’ve been testing Norton AV 2009 for quite some time now and it never 'caused any conflict. I must say they make a great time team: both light and offer a great protection; CIS mostly for its prevention (Defense+) and Norton for the detection.
I have Comodo AV installed, because before trying Norton, I had CIS fully installed and wasn’t going to bother uninstalling the av component. But it’s active protection is disabled.