Reboot, try again. 

Online installations can be messy.
I'd recommend OFFLINE installations of both Java & LW.
(1) Remove all previous versions of Java, then reinstall java with Offline installer: 
Download Java software from Sun Microsystems 
(2) If you had a previous version of LW on computer earlier, for new version it is best to delete the previous LW Preferences folder; delete your LW Preferences folder whilst LW is 
closed; instructions here: 
Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)  
http://www.gnutellaforums.com/genera...der-vista.html 
(3) Run this small utility to clean registry:   
Crap Cleaner 
(4) Offline version of LW: 
http://www9.limewire.com/download/LimeWireWin-full.exe