Everyone should use a firewall, indeed there's no reason why you can't use a hardware-based firewall on your modem and then a software firewall on your PC. There are a wide number of free and commercial firewalls available, including the popular ZoneAlarm.
ZoneAlarm 7 has just been released and the free basic version is available to download. The new version has an updated firewall 'engine' that will look for and eliminate malware from your computer. It has a new auto-learn feature so it keeps ahead of new threats and general improved protection against external attack. Of course, this download is the free basic version and there is a Professional and Internet Security Suite version available.
Download ZoneAlarm 7.
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