Try this...

uninstall limewire
uninstall JRE

reboot

download JRE2 1.3.1 from java.sun.com
download LimeWire 1.6d from www.limewire.com

install JRE (first)
install limewire

this prevents Lime from installing it's own copy of the JRE and uses the official one from Sun instead. It could be the exact same JRE file for all I know... but the above is what I did and it's solved a half dozen problems I was having.