I would try to stick with the newer version of LW, as it is more likely to work with your newer Java. What version of Java do you have (should be able to see it in add/remove programs). Try this version if you have 1.6.1 and it's not working.

Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

You could also try deleting your preferences folder (instructions in link):

Fixes for Limewire

If you still need help, post your details:

http://www.gnutellaforums.com/connec...-you-post.html

Good Luck

Dan