Have you ever used LW 4 & if so, was that version working ok?

Was the link that I posted in post #3 the same one that you'd seen before? If so, did you delete LW's preferences folder?

Do you only have one version of Java installed on your computer?

Try the older version of Java that I linked to in post #3.
Download the JRE offline installer. Remove all other Java versions installed on your computer via Control Panel. Next, install the version that you've just downloaded. Restart your computer.