How do I fix my Batman Arkham City corrupted data?

This has happened to me twice already.When I am playing arkham city and get to the part when you have to track down R膩's al Gh奴l,The game stops and says that the game data is corrupted and I have to delete it and restart the game.How do I fix this?How do I fix my Batman Arkham City corrupted data?
Hard to say, I would try deleting the game data utility under the xmb and reinstall the game data (do not delet game save data)

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