ZoneAlarm

It is free firewall for all Windows. It is currently the number one firewall product in firewall rank. The program is to be used side by side with your antivirus whatever it was; it does not conflict with the antivirus. If you are using a free antivirus (most of us do), then your antivirus protects you against viruses and spyware but it does not protect you against hackers and unauthorized access to your computer through network or the internet; here comes the importance of using a firewall.......