Harry Potter and Deathly Hallows part.1 [game]

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I start it now on my pc, but it seems i have some problem.I'm talking about the game of course.On the mission in the Umbridge's office i beat her, and then the two mans that come out, but then nothing happen.I can't get out from the office and actually can't do anything.Hope someone can help. By the way do you like the game, and on which game platform you play it?