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Try Eset Smart Security 4 (it's a firewall, antivirus, antispyware and antispam in one.
It was developed from NOD32 and I've been using it for 3 years, great product, never had a problem. Main advantage is it comes as bundle, so there are no firewall-antivirus conflicts. Quick, easy to use, and takes minimal system resources.
I wouldn't rely on free products unless you can afford loosing time and reinstalling the whole system. Well look at Virus Bulletin results, ESET products are rated among the best. Good option is also Kaspersky from what I heard, but I have no experiences. As for Norton..... it's TERRIBLE. Used ii for a year, it's HUGE, takes resources so it slows down computer.
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