If your games and apps aren't working, or if you don't have access to the store or to Live services, you are probably running in Developer Mode.
To figure out which mode you're currently in, press the Home button on your controller. If this takes you to Dev Home instead of
the retail Home experience, you're in Developer Mode. If you want to play games, you can open Dev Home and switch back to Retail Mode by using the Leave developer mode button.