Final update.... Victory !!!!
I just updated my dinosaure X3a version to X3e and VOILÀ !!!
Now I can see clearly my view video window anywhere on my 2 PC screens !!
And more.. X3 now accepts many more video file types like HD .MP4 easily.
I'm very sorry for having waisted some of your time folks..
I should have checked my X3 version before trying to fix any of its issues.
So it's solved and I'm so happy.
Logging out.