Cannot sync with iTunes: This computer is no longer authorized for apps that are installed on the iPhone I'm not even trying to sync apps. I only want to sync one movie. When I try to sync, I get this error message.



I click the Authorize button, it asks me to enter my iTunes password, and after that, it gives me this error.



I even tried to go to the menu > iTunes Store > Authorize This Computer, but it still gives the error. I also tried to de-authorize the computer, but it gives the same error when I try to authorize. I ran the diagnostics in iTunes and they all passed. (I did not run the CD test.) I checked for updates and it says it is the latest. I have the box checked in preferences to "Automatically Update".

Windows 8.1, iPhone 5, iOS 9.2.1, iTunes 12.1.2.27
Try this : 


Open iTunes 
From the Store menu, select "View my Account..."
Sign in with your Apple ID and password.
Under "Computer Authorizations" select "Deauthorize All".
Authorize each computer you still have, as you may require.


Then restart iTunes, and try again to autorize your computer with your Apple ID