Did you download COD Black Ops through the XBOX marketplace or did you use the disc to install the game in your hard drive?
If it is the first case delete any data relating to Black Ops and try re-downloading the game again.
If you installed the game through the use of your Black Ops disc , you are still required to use the disc in order to play the game. Playing the game through your hard drive (with disc) will reduce your Xbox from overheating.
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