Which version of Java do you have? If you have version 1.5 then uninstall it using your Add/Remove control panel. Then install Java 1.4.2 But if you have Java 1.4.2 then install Java 1.5 Sometimes one version of Java doesn't run well on particular systems. Please choose the manual install. See links here:
Fixes for Limewire You could also try the other options listed there such as changing LW's compatibility, etc. if the Java installation still doesn't fix it.