The best Antivirus in my opinion is Kaspersky (KAV) and I have used them all and none of them compare to KAV. Best Firewall would be Sygate, but I don't run a firewall on my computer, because I am behind a router and it has it's own hardware firewall.
Antivirus -- Mcafee. . Firewall -- Black Ice, OR Zone Alarm Pro. (I've had both, and No one's ever gotten past `em.)
mcafee is the best, norton has crap technical support, you have to pay to talk to tech support at norton.
screw all of them norton only has 89% clean rate mcaffee 93& and kaspersky 99.8% so kaspersky for me no missed virus that any other AV's havent picked up firewall sygate,black ice , or zonealarm all have blocked about 50k intrusions EACH
For firewall I say sygate I use it and it works really well for me I dont know anything about an anti-virus