Internet-connected computers (particularly those running Windows) face a host of threats from various sources — these days it can often seem as if your PC is at risk from everything but e.coli.
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Using a broadband router/firewall for protection is a good start, but it can’t guard against some of the most serious and prevalent threats like e-mail or Web page-borne infections and most don’t prevent people from accessing inappropriate content. For that kind protection you typically need to supplement your router’s firewall with Internet security software that runs on a PC.
Of course, PC-based security applications protect only the systems they run on, so an increasing number of people with more than one computer face the expensive prospect of buying separate security software for each system, or even worse, leaving some computers unprotected.
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Adapted from PracticallyNetworked.com, part of the EarthWeb.com Network.