It doesn't have a firewall or some other things that the Comodo has.

You do have youre windows firewall but most say it is not the greatest...

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here's some info-
http://free.avg.com/download-avg-ant...s-free-edition
there;s a chart on the page showing what is not included on the free vs the paid AVG

[What you don't get with AVG 8.5 Free

* Protection against identity theft, hacker attacks, infected downloads, infected instant-messaging and spam
* Protection for business computers, networks, and servers
* Support from AVG technicians (although user-to-user support is available at]

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