Lan Echo Requests being blocked

Hello everybody, I’ve discovered that the Network Map in the Windows 7 is not working when Comodo Internet Security firewall driver is enabled on the LAN card. With Comodo Internet Security firewall disabled,it works. Here are some details:
CPU: AMD Sempron 3000+ 64bit Processor
OS: Windows 7 Professional 64-bit
Other security programs: Avira Antivirus Free V.10
Firewall running in Safe Mode and Defense+ in Clean PC Mode
I’ve disabled Windows UAC
Thanks a lot and have a great day!