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.) Make a note of all your settings first under tools > Options.

If still problems, check the later points such as compatibility mode in the above link.
Another possibility is your Java is semi corrupted, in which case you should re-install Java using the OFFLINE installer Download Java software from Sun Microsystems