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Hi,
I have been using AVG free for years and it works for me. It is light on resources and scans your emails as they come in.
That combined with a natted router will act as a firewall and protect you from the internet worms which wont see your pc as it has a local net IP.
If you decide to open up some ports on the router, say to run a web server or to access your pc from work then most routers these days also have a firewall capability.
Paul
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