I downloaded the Crysis 3 beta when it was out and I pinned it to the dashboard. Now it is stuck there, I can't unpin it and I removed the game from my hard drive but it's still pinned.
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I would contact xbox support also, either on twitter or by phone or website. Hope you get it resolved!
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Try xbox.com
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Edited by Trentonimor: 2/25/2013 12:04:44 AMI hear if you stick a bar of cheese into the hard drive slot and let it melt it cleans the dashboard.