Several things you can try. But 1st you should configure all your firewalls to allow both LW & Java full access & yes your router has an internal NAT firewall which will require a port to be forwarded.

1. Common firewall instructions: http://www.limewire.com/english/content/firewalls.shtml

2. Set up a static IP instruction at the following link BEFOE opening a port for LW to have full access.
Port Forwarding instructions for the Dlink DI-604

3. Force IP within LW: Force IP instructions & sample image

4. Update your Java: http://www.limewire.com/english/cont...radejava.shtml

5. Repair LimeWire using the Add/Remove Programs utility. Go to Control Panel then Add/Remove Programs & click on Limewire on the Change/Remove button & it comes up with options and one of them is Repair. Try this.

6. Right-clicking the Limewire icon and going to properties and changed compatability setting to Windows 2000.

Try these things 1st & see how they go.