I purchased Batman Arkham City: Harley Quinn’s Revenge game DVD from the local game store. I got a serial key along with it and other details in the manual. I installed the game and the part where it asks the Serial key, I inserted the code that came with the game. But the game shows, ‘Invalid Key’ error and fails to install. The game which I purchased is original and the serial key also came along with the packet. Can anybody tell me what can be the problem?
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