Are you sure you downloaded the LW 5 version & not the classic version?
I am aware
iTool has an option for Resetting Launch Services which may or may not help your scenario.
Go to your
Go menu & choose Utilities folder. Open the Java folder. Open Java prefs, see if Java 1.6 (Java SE6) is listed.
Setting up Java for Leopard (see 2nd image)
If Java SE 6 is not listed then your computer is not compatible with Java 1.6/LW 5. In that case see
http://www.gnutellaforums.com/mac-os...ck-lw-4-a.html