Your ISP shapes p2p usage during peak times, so it sounds like you may of popped up on their radar...
Traffic management
You could try Port Forwarding to get rid of the firewall you are seeing as your router has one...
These are your instructions...
Port Forwarding for the Linksys WRT54GS
You can also try uninstalling your 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
And finally if all else has failed you can try deleting your preference folder...
Fixes for Limewire when LW isn't operating as it should 