Why doesn't Java3d applets work for everyone?

I have a site with java3d applets:
http://www.psyanimations.com
Quite often, the visitors to the site can't get Java3d-applets to start even if they have installed Java3d.
Eventhough they have modern PC's with new operating systems and hardware. Why does this happen? I have a detailed page with descriptions on how to install it:
http://www.virtualexp.net/install.htm
but still about 1/3 of the visitors have trouble getting Java3d applets to work.
This annoys me a lot. I'm considering to start program my visuals in some other language than Java3d.
It just don't seem reliable when so many people can't get Java3d applets to work. What reasons could there be for a Java3d applet to not work eventhough Java and Java3d is installed?

Do the visitors with problems receive any specific error messages?

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