well service pack 2 firewall is working good for me.... and ive had thois PC for 2 years and never got infected. And I never used an anti virus, you just have to be careful.
You htink all of them companies that got infected by all that junk didnt have anti-virus? Im certain they did, but they dont work in time.
And I have 3 security measures. 1 I have a physical router which is my main line of defense and keeps anyone from trying to connect to me. Then I have my windows firewall which stops any programs from accesing the internet. and then I have mozilla which stops websites from doing bad things.