Beware that you haven't picked up a virus: WARNING: Viruses on network you should be aware of! (click on blue link) at least one of which causes LW to continually re-open.

So first be sure it's not due to a virus or similar, and clean it out of your system.

Otherwise I'd suggest 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.)

Remove all Java versions & reinstall using only the OFFLINE installer: Download Java software from Sun Microsystems

Run this utility to clean registry Crap Cleaner

Reinstall using this installer: http://www9.limewire.com/download/LimeWireWin-full.exe