Before you consider re-installing, try deleting your LW Preferences folder whilst LW is
closed; instructions here:
Point #2 in Fixes for Limewire (sample image included.) & try again. If still problems try uninstalling & reinstalling Java using the "Offline" installer version.
Do you not have a backup LW installer? LW Pro does not use online installation. So you would have originally downlded the offline installer. Check to see if you still have it anywhere.