Trend Micro makes an antivirus software for FREE at http://www.trendmicro.com/en/product...e/overview.htm

Anything else you need go here http://www.ppc4all.com/

I think they have firewalls etc... there.

Edit: I found one combination firewall/antivirus but I have never used it
http://www.ppc4all.com/appdetail.php?id=1932