Firewall: The Door
We've found the three best firewalls around... and best of all, they're free! Note: Ensure that you either make your existing Anti-Virus/Firewalls compatible, or uninstall them. Advice? Do yourself a service and don't use the over-bloated, resource-hogging, Norton or McAfee software.
Check out the review links which contain user comments - and then download from the secure sites listed below.
Zone Alarm
Pros: Fast, Free, Easy-to-Use, Clean Interface
Cons: Slightly Bloated, Less Functionality
Sygate
Pros: Fast, Free, Easy-to-Use, More Functionality
Cons: Free Version Discontinued
Keiro
Pros: Fast, Free, Easy-to-Use, Friendly Interface
Cons: Unstable (Very Very Rarely)