Download Sygate Personal Firewall
Sygate Personal Firewall is more than a simple firewall you can use to protect your computer; instead it will become your guardian and keep your machine safe from any intruder that attempts to get into your system through your network traffic. What this application does, is to encode your traffic data to stop hackers to understand it and enter inside your registries.
This is perfect for common users who don't know a lot about computers, however is the best your will be able to find around there. It's highly recommended by old users who have been protecting their computer with this tool for years.