I just switched to KAV 6.0.300 yesterday
Previously, I used ZoneAlarm Pro Firewall & NAV 2005, during installation it said to uninstall NAV 2005, but nothing about ZAP, so i just uninstall NAV 2005, rebooted & cleaned the folders. Then install KAV with ZAP disabled & no problems at all
However, i disabled Protective Defence accept for Office guard, ZAP does that