I,m certainly not an expert on firewalls, but I do run Zone Alarm with a broadband connection. Just a couple of days ago while surfing, I receive several alerts that ZA had denied access to my system from an outside source.
As I said, I don't know a lot about firewalls, but I would recommend that you run one, just to be safe.
I,m sure that someone, with more knowledge than I, can shed some light on this subject.
I am connecting to the Internet via a wireless access point/router? Does the AP/router act, in fact, like a hardware firewall eliminating the need for a software firewall like Zone Alarm? I would go with Zone Alarm over Norton or McAffee because the latter two apps are just too big and onerous.