Well on my windows box i use Norton Internet Security, which consists of NAV 2002 and Nortons personal firewall which has done the trick for me, automatic update for the AV s/w and a VERY easy to configure firewall, hard to wrong really!

But as prodikal mentioned, your AV and firewall s/w is only as good as your last update, so it is vital that you update as often as possible.

Just my 2p worth.

Cheers

r3b00+