It seems that no one had the same problem with this video card, so I asked Nvidia for help (where I should have gone from the beginning).
We are trying some solutions, but we have not yet been successful.
As soon as we solve this problem, I'll come back here with the solution.
I'd try to install and use the nVidia driver version 386.01 that was suggested and certified by Dassault for use of nVidia GPU P2000 with Dassault software solutions (see Hardware Configurations - Dassault Systèmes® ).
Let me know, if it works.