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That happened to me too but it was Call of Duty 5: World at War.
You probably moved your Xbox 360 while the game is running causing a circled scratch on your disc.
In my game I can only play up to half the game. The other parts just say Disc is unreadable.
Just trade in your Disc dude.
Go to Block Buster Rent Halo 3 and switch the Discs then don't even check it.
Or any other video store that has Halo 3. Just make sure they don't check.
Or if you bought the Halo 3 as a used game then return it if its still under warranty. As for anything else thats all you can do.
You can clean it I tried already its too late.
Return or switch it.
Good Luck.