Firewalls are meant to protect outsiders from attacking your computer directly, such as hacking attempts or network viruses like Nimba and Code Red a few years ago. They aren't meant for malware or viruses. I'd recommend a full security suite that has firewall, antivirus, and anti-malware protection. Norton makes a decent product, but I've had customers run into email issues with it. Trend Micro also makes a decent product, as does MacAfee.
"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited
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