I'd suggest uninstalling your java versions you have & reinstalling using the control panel. Then reinstall LW using the "Offline" installer (it will uninstall the previous copy of LW at beginning of installation.) recheck your Norton FW settings; Configuring Norton Internet Security. Make sure your XP or any other firewalls are turned OFF! Also, 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.)

I can't give much more advice because you haven't given your system & peripheral set up specifics.