1. Try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.) If that's doesn't help then see below.

2. Use your add remove control panel to remove all previous versions of Java you have. If necessary remove all & reinstall Java using the "Offline" installer. Sounds like a java issue to me.

Note: Rogers have been known to block or shape p2p users. Also, your model router is known as a lemon. It's unreliable performance-wise. But if it works for you then that's good!