The latest java is usually best, however on some peoples systems one particular version works much better than some others. You need Java 1.6 (6) for LW 5 to run however! Java 1.4-5 is fine for LW 4.
http://www.gnutellaforums.com/downlo...downloads.html
Did you tick the box to leave a shortcut to LW on desktop? Install the latest version ... especially IF you are using vista .. right-click the installer & choose
Run as then choose Administrator .. then install LW .. then repeat process for the LW shortcut on desktop.