>I installed but the configuration dialog for the webcam does not fit the wall screen >thus, I can't push "next" button and I have to close the window. Do you have any >trick to setup the camera ?

Click the zoom key on your tablet, you should then be able to click the Next button. If that doesn't work for you, you can also click the checkbox that says something like "use low resolution web cam" and then click the next button once the image gets smaller.