Usually when your when you get "Page cannot be Displayed" it means that your ISP has some sort of Bandwidth shaping against p2p apps...
But if you can tell me the model number for your Comtrend modem, I'll have a look and see if it has a Nat Firewall...
In the mean time you could give these a 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