Zone Alarm seems to believe, rightly or wrongly, that you're running either InnoculateIT or eTrust anti-virus software, and it's indicating that these products can conflict with Zone Alarm.
If you're actually running one of these programs, you could uninstall it and replace it with AVG Free Edition (or possibly Avast). Alternatively, you can simply ignore the 'update available' message. (Unlike anti-virus software, firewalls don't generally need updating. The messages from Zone Alarm are just a way to draw your attention to their commercial products, which you don't need).
Chris