NetDefender is a personal firewall for Microsoft Windows, released under the Microsoft Permissive License. It runs on Windows 2000 and Windows XP. It might also be able to run on Windows Vista and Windows 7.
1. Netdefender can only run on an OS higher than windows 2000 (i.e. Win 2000, Win Xp I hope Vista would not break anything)
2. User must has admin rights (i.e. must be member of administrator group ) on the system.
3. Default Firewall of windows Xp must not be running . In windows Xp with service pack 2 Default firewall is always running. So you need to stop it before running the Netdefender.
creen Shots :
Main Screen :
Add Rule Dialog :
Port Scanner :