XBox 360 Minecraft Corrupt?

So my brother got an XBox 360 from GameStop but we forgot to get the one with an HDMI slot,so we returned the old one (saved the hard drive), and then we went home with an Xbox 360 with an HDMI slot.Then, we got the XBox 360 working again and I tried playing Minecraft (since we already bought it), but it said it was the trial and when I pressed "Start Game" or whatever,it said something about an corruption and I had to reinstall Minecraft,so I did, but it still said it was the trial! Please help if you know the answer to this problem.

Thanks!

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