after uninstalling/deleting the above full/partial installations;
i suggest run ccleaner first. download it fown
www.ccleaner.com
then try a fresh installation of zonealarminternetsecuritysuite. it has firewall, antivirus, anti-spy, etc. so u dont need to again install zonealarm pro.
i too have just installed the ZA ISS v6. its nice but a little heavy on the resources.