I rented a movie and now it won't play, just a black screen.
My computer is authorized, but still nothing.
Hey Chris,
Sorry to hear about your movie not playing.
I would go over the following document for basic troubleshooting on iTunes for Windows:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues
(http://support.apple.com/kb/ts1717)
That article in particular is for Windows Vista and Windows 7, but we also have a similar article for XP here:
iTunes for Windows XP: Troubleshooting unexpected quits, freezes, or launch issues
(http://support.apple.com/kb/TS1421)
Cheers,
David