Solutions
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blake7's post in Activation problem B77W was marked as the answerOk, solved ...
I ended up reinstalling a fresh version of windows, ditching everything back to factory default.
First thing I done was to install FSX and the 777 setup before anything else. This resulted in a successful activation ...
So, now for the painful process of putting everything else back onto my computer.
Thanks Ryan and RSR for your help.