Download NetManager Light
NetManager Light this firewall is highly customizable and counts with 5 predefined levels of security.
it's recommended that you use this firewall together with an antivirus of your preference. Is not as strong as other firewalls but it's free and it gets the job done. It's perfect for users who need to protect their computers in the most basic level of security and whose information storage in the computer is not vital.
However it fills the gaps many other firewalls left behind and even though is not that powerful it works just fine.
Easy to use for everyone and compatible with Windows Operating Systems.