TWD EP2 PC : back screen when starting ep2

Hello,

I can't play ep2 with steam version : when i click play, there's a black screen, the cursor desapear and the only thing i can do is to kill the task.
The ep1 works btw.

I also have telltale version but with this one it's even worst : the damn stupid DRM won't allow me to go to the menu at all. I enter my login/pass then nothing happens...

Is there a solution, except re-re-re-re-re-installing the game ?

I'm on Windows Xp sp3
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