Try reinstalling this version of Java. Use the JRE offline installer & remove your current version of Java before you install this one.
Java SE Downloads - Previous Release - JDK 5

If that doesn't help, try deleting LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things.

If that doesn't help, tell us the model of your Vonage router (LOTR did ask you but you never told him).

Shaw are known for p2p bandwidth throttling, but I'm not so sure that they block ports ( I assume you're using Shaw, because you used a Shaw firewall).