Well, my problem has just been fixed,thanks to the support chat service of Adobe.
I'll describe the solution for you guys, it might be useful to somebody
The solution consists in going under windows START button, at the bootom left,
then Hold Ctrl key and click on Acrobat X.
You are now able to change a language for Acrobat.
I just had to chose the language to be the same as my Computer wich is french. et Voilà !
problem solved.
PS. thank you @ Kglad for your feedbacks