Solutions
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Pierre-Jean's post in Can't launch 777 and No DATA in Operation Center was marked as the answerOf course.
Old Fellow,
I just un-installed 777 200/300ER with the 2 installer.
And also removed the OC directory, and all instances Rep. or file "PMDG" in the P3D Rep and in the Rep. "Roaming", so everywhere.
(Except of course respect FSX)
Now the 777-200 / 300R work well and are doing wonderfully in my v2.4 Prepar3D with the beautiful sounds wonderful in 5.1.
Finally, I see shadows moving on the dashboard ... Fantastic.
Case closed, and thank you for your help Chris. ;-);-);-)
Regards,
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Pierre-Jean