So I purchased and downloaded "Dead Rising" on the X-box marketplace.
I go to play the game...and it will give me a "This cannot be read" error...and tells me to clean the disc with a soft cloth and restart the game.
It was a download...hence no disc.
I talked to support, they had me delete the game, clear my cache 3 times in a row, and re-download the game. It still does it.