If that doesn't work which hopefully it did. Then here is one more simple step will definately work.

Control Panel/Network and Internet Connections/Windows Firewall/Advanced tab/Settings button beside Local Area Connections Box/Under Services Tab, click ADD/ description of service "Gnutella", "external and Internal" type in 30446/check the bubble "TCP".
After that ADD another/ everything exactly the same as previous, but this time check the bubble "UDP".
Make sure you have a check mark beside both the new "Gnutella checkboxes.

This or my first post should most definately solve your problem.
hope this works!! Good Luck