I've used both, and view a lot of posts on various security forums regarding security generally. Currently using Avast home edition, and very happy. It is possibly the most configurable of the free AV's, the detection and cleaning engine are the same as used in the pro version. Only drawback is you can't schedule scans. http://www.av-comparatives.org/ is a useful and authoritative site to see how AV's perform. (Or rather, performed.) Avast is always in the top few, as is AVG, and usually ahead of both is http://www.free-av.com/ (Avira) There are other free ones, such as Clam, which is a scanner only, and others that come with snags or hooks, such as the AOL offering, but the three "A's" are the main ones. You'd be pretty well protected with any of them. If you're a non-expert, or risky surfer (as most non-experts can be) you may want to consider additional security, which can also be downloaded free. Such additions might include a two way firewall, a hosts file or other immunizing systems, antispyware, a HIPS, or sandboxing/virtualisation, andor imaging. Tightening up the permissions in IE is not a bad idea, either, particularly in regard to scripting. Or use Firefox or Opera.
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