Try downloading the latest Java client from sun microsystems 1.4 i think they're up to. get it here http://java.sun.com/j2se/1.4/download.html

After you d/l it be sure to uninstall the 1.3 client and restart limewire ... it will say that it cant find its client ... direct it to the 1.4 client and you are set.

c:\program files\java\jre1.4.0\bin