So : 

-I changed my username ( I create a new one without accent, even mine doesn have ), I put my PC in english language.

-I installed the new nvdia drivers ( i have a 940M )

-I put "high performance" in nvidia control panel

-I renamed %APPDATA%Ansys



I uninstall and install again several times ( all 3 version, the discovery version doesnt not have bench, but aim student has one, and it the same error )


NB :

I installed in my D: harddisk,  I didnt try in my system disk C: because it's only 20go free left.