THank'you to everyone. I've finally succeded in starting io.
It was a license problem.
I'v put in license folder about 80 different license codes (dowloaded from [Only registered and activated users can see links. ]).
I was sure that Q3 license was enough but perhaps it's not...
Now everything is OK.
Thank'you for you kind and fast help. It has been a great help to solve.
Lorenzo