Best free antivirus firewall- something like norton but free

[Antimetrics]

Title says it all

 

[NeeKo]

Common sense.

You will never find a better protection online.

 

[sincreator]

Microsoft Security Essentials if you have Win Vista/7/8. You can also scan using F-secure online scanner. AVG as well, but I've had trouble with AVG in the past. Now that was 4/5 years ago....

 

[Antimetrics]

How about avira?