Personally, i would say that ZoneAlarm 7's antivirus has improved over the previous version. I think it is mostly attributed by the switch from ZA6's E-Trust build-in antivirus to the newer built-in antivirus based on Karpersky. Plus, I noticed that there are more frequent antivirus updates compared to the previous version. So, i guess this would prevent zero-day attacks. Just my opinion though.