For over the past 5 years now i haven't ran a popup blocker/anti-virus nor a firewall. An i haven't had any problems at all. Hell i don't even do a windows update. (I got my system restore turned off and automatic updates turned off.) Btw.. i don't recommand zonealarm for a firewall at all.. Since a very nice and smiple DDos attacks can kill the firewall without any problems at all.. So i recommand using "8Sign Firewall" which you can get here: http://www.consealfirewall.com/ it's very very easy to use and don't have alot of crap build into the firewall like zonealarm. An easy to make your own rulesets, which can be imported from older versions of the firewall or if u had to do a reinstall.