Ok let's leave the Port Forwarding for the moment, you need to have a LimeWire preference folder...
So let's try this first and see how we go...
Uninstall 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
Then uninstall Limewire using the uninstaller which is found in start > all programs > limewire...then re-install it using the offline installer...To find the offline installer, use the link below > cancel the installer window when it pop's up and then select the offline installer link...
Lime Wire ยป Download LimeWire
let's see if you can connect to your downloads now....
Then we will tackle your Nat Firewall...