If you are not seeing a wall in front of the globe you must have Norton configured correctly as well as your modem/router....
You could try these fixes..
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
If that does not help with your problem try deleting your preference folder...
Fixes for Limewire when LW isn't operating as it should
The only thing I can see that would be effecting your connection would be Virgin as they are known to shape p2p bandwidth...
Traffic management