I can't get java to run, why?

I have Java installed, correctly I think, and I can't get it to work. I've checked the issues that were mentioned on the java site and still nothing. I don't know why it doesn't work or more importantly how to fix it. Any ideas on what I can do?
Thanks

Alright, I made a mistake that I should have not done. I should have stepped back and reread my post to see how it sounded. Being that I tried to be kind and simplify what I did for easier reading I didn?t realize that I left out too many things so it fell way short of usefully.
We have a new machine here that we just installed Java on and it didn?t work either. This led me to think it is our router that is causing the problem. I gave that a quick test by taking the router out and Java worked on the new machine. Put the router back and the Verify Java page worked, but when going to another Java site it wouldn?t work. To me it sounds as if there is a setting in our router that is blocking something. We don?t know too much about routers so I?m not sure if we?ll ever figure that out. Is there anyone out here that could give us a few hints on what to look for in our router config. We are using a Cisco router.

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