Have a look at these Port Forwarding instructions, this will help you set up your router correctly to allow Limewire access through the Nat Firewall..
You will not have to re-do the static IP part if the computer your having trouble with already has one...
Port Forwarding for the Linksys WRT54GS WRTSL54GS is similar to the
WRT54GS while adding additional firmware features and a USB 2.0 port (referred to as StorageLink) which can be used for a USB hard disk or flash drive.
Unlike other models, the WRTSL54GS only has one antenna.
You could also try...
Try uninstalling all versions of Java from the add/remove programs and then re-install the JRE 5.11 offline version....
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11
Also try deleting your preference folder/s...
Fixes for Limewire when LW isn't operating as it should