Xbox 360: How to Delete System Cache
On the Xbox 360, if you’re having issues with your games, or if you just want to purge your game updates, then you can delete your system cache.
Navigate to the Settings tab on the right and select System, then go to Storage.
Hi-light your hard drive, but don’t press A, press the Y button instead to select Device Options.
Select Clear Cache.
It will prompt you to confirm your storage device maintenance, click Yes.