I just decided to try Comodo after reading lots of good stuff about it. I have XP Pro SP2 and use KAV 2006 and PG 3.15. No other security programs running. I have never had Norton products on this computer or any firewall other than the Windows firewall which is disabled. I disabled PG for the Comodo install. I was asked to reboot and upon rebooting I was greeted with 5 popups from Comodo. I was rather taken aback to put it mildly. I assumed that Comodo would not start on the reboot but that I would start it manually and learn about it and configure it and then reboot to have it running properly. I tried to read the first popup and saw there were four under it and intended to just click ok on all of them but couldn't. The computer was frozen. I brought up Task Manager and actually had Task Manager freeze..never had that happen before. CPU usage was at 65%. I finally had to resort to the button on the tower to shut down. I rebooted into safe mode and uninstalled Comodo. I was quite surprised with the entire experience since I had read a lot of positive comments before I decided to try it. Does Comodo not get along with KAV 2006? PG was still disabled so I don't think that was the problem.