Comodo Internet Security
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Full user review
"Comodo Internet Security is excellent"
This is antivirus , firewall , virtual browser (which opens on demand and does not effect operating system no matter which sites you browse) , also has sandbox and real-time registry protection , all in one for free = COMODO ICS PREMIUM .
Despite all the levels of protection this is very light AV and does not affect system too much , and works on any computer.
I have installed it on 'ancient' 10 years old IBM laptop(1GHz 500MB) five months ago and it works well and boots very fast .
Firewall can make problems with some wifi adapters on Win7 , and if you see any just reinstall Comodo without firewall .
cool antivirus package with a lot of extras .