I got it working. I updated my Crescendo plugin on 4.75 to version 5.1, shut down all nonessential NT services, and installed Netscape without the Sun java plugin. First time I loaded a site, it wanted to install the java plugin, and I let it - it installed fine and still works.
http://bbscomp.com/george/NS6.jpg
(Not using the "img" tags on purpose - don't want to have a 130K image slowing the thread loading)