I've never used a firewall, I do a virus scan from time to time when I suspect something, I install the free AVG, then uninstall it again because it's just a waste of memory and processing power. I've had a spyware/virus problem once, but it was overall pretty minor, and it's been about two years since then.
I really don't know what most people do that they need a firewall or virus scanner, but then again I guess I don't spend my time wandering around the dark alleys of the internet.
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