Try uninstalling Java using the Add/Remove Programs control panel. Then re-install Java: Fixes for Limewire

Do you know whether your Belkin router can utilitse UPnP technology?

Also make sure your firewalls are configured: http://www.limewire.com/english/content/firewalls.shtml Make a note that it's not always wise to run 2 firewalls b/c they may interfere with each other.