Instructions
Deleting DLC
Navigate to the "My Xbox" tab on the Xbox 360 main menu.
Select "System Settings."
Select "Memory."
Select "Hard Drive."
Select "Games."
Select the game and the DLC you want to delete, then select "Delete."
Re-installing DLC
Press the silver "Guide" button on the front of your Xbox 360 controller.
Select the "Settings" tab.
Select "Account Management."
Select "Download History."
Select the game and the DLC you want to re-download.