Well, I'm gonna do the questions and answers.
Maybe that could help other people. I don't understand the error. Finally, there seems to have direct link with the fact that the phidgetmanager is lauch or not. More strange: after an other stack of test, I finally get the error all the time, then a new one: "error 1555: the know method is corrupted" (approximated translation).
I get the error even with the original exemple, whereas with my first test it always work. Then, I have reinstalled the phidgets librairies and now, I have got no error anymore (for the moment) and better: I also don't have the message "wait while windows is configuring..."
So, this is more and more mysterious for me but hopefully, it become better and better. Well, if someone could explain to me what's happened, it will be very kind. I'm curious to understand why; moreover, I will have to make that work on another computer, I hope there will be no complications.