So far I haven't heard about such a problem. But if I had personally that problem, I would start to try several things:
The first would be to delete the " .limewire " preference folder when LW is completely closed (i.e. also in the system tray -after restarting LW the configuration popups will show up) as described in Point #2 & 3 in Fixes for Limewire:
http://www.gnutellaforums.com/showth...threadid=36420
If that had no success, I'd uninstall all Java on my computer and use the JRE offline installer of the newest Java version to re-install it:
http://java.sun.com/j2se/1.5.0/download.jsp
And if that didn't do the trick, I'd uninstall Norton to see if that makes any difference.