I understand you when you say 'free' *cough*, but try Comodo.
I know you can't help thinking of old ladies smelling of wee when you hear that name, but it is actually a very good firewall and antivir, and it is actually free !!
Firewall and AntiVirus Free Software Download from Comodo
Avast is the best free one out there. If you want the Pro version, check the usual places, or drop me a PM....
When I used AVG and Avast, they always wanted attention. I hate antiviruses that need attention, it's not like their job should need any human interaction other than when a virus is found.
I therefore use Comodo internet security. It just sits there and never interrupts you, but does find viruses and so works. Perfect.
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