Zone Alarm and Pest Patrol are products from separate companies which seem to have partnered up. I've been using both for a few years and each has offered renewals or purchase of the other at licence renewal time.
My arsenal is ZA Pro, Pest Patrol, Spybot S&D and AdAware. Antivirus is Trend Micro's PCCillin. I use Slimbrowser with its pop-up killer switched on and Mailwasher to screen suspected nasties in email. Am thinking about Benign from the Mailwasher people as an extra level of protection against embedded nasties in HTML emails, but feel that with all the foregoing it might be a bit OTT!!
Anyway, it all seems to work and I freely recommend it if anyone's searching for an effective setup .
AA