Reinstall Java. Use the JRE offline installer here & remove your old version of Java before you install the new one.
http://java.sun.com/javase/downloads/index.jsp

Now reinstall LW & make sure to use the offline installer (not the recommended one). No need to uninstall your original LW, it'll do that automatically when the new version's installed
http://www.limewire.com/english/content/download.shtml

See if that helps!