Thanks for your advise
Finally I found the solution...
I completely uninstalled the previous driver (removing the video card component in control panel).
Then... instead of reinstalling the latest driver from the directory (I mean : click-on setup.exe etc etc...), when the new device has been detected during the boot sequence I pointed on the Nvidia directory and the system installed the driver from there! BINGO !!! it works fine now
Finally I came to this conclusion :
The crash only
occurs when installing the driver from his directory (Asus official driver or Nvidia Forcewave!) : setup.exe
Anyway thanks for your reply !