There are a number of combined anti-virus with firewall packages. one can be obtained via click here Initial registration is required for a free twelve months protection. I cannot vouch for this product, as I have never used it. I prefare ZoneAlarm and AVG as two separate units.
More info and downloads for other Anti-virus and Firewall products, are available via click here This site also holds various other good info and downloads.
rawprawn--The link that I gave, is the same product link that Belatucadrus also suggested , is for the etrust combined antivirus and firewall. The firewall is the clone from ZoneAlarm Pro, so in reality you get ZoneAlarm Pro free for a year as an extra in the combined package.