The iTunes store looks like this ↑, video playback has the same problem. The videos play fine when launched in Quicktime so I don't think that is the problem. I have reinstalled iTunes and that has not fixed the issue. How can I fix this?
If you are seeing distorted video in iTunes, you may want to take a look at the troubleshooting steps in the following article:
Apple Support: Troubleshooting iTunes for Windows Vista or Windows 7 video playback performance issues
Retrieving data ...