Ok...Let's leave the router out of the equation at the moment and just work on the modem...Unplug the router again...Make sure you used the same one number for each box in the instructions and that you also entered that same number into the manual port forward box and listen box and then selected apply in Limewire...
So you have Port Forwarded the modem...Yes..
Now try these fixes and see if they help...
Uninstall your Java from the add/remove programs and then re-install the JRE 5.12 offline version....(4th one down)
Java SE Downloads - Previous Release - JDK 5
If that does not help try deleting your preference folder...
Fixes for Limewire when LW isn't operating as it should
If you still have no luck, what security do you have on your computer...