HT204668: Locate and organize your iTunes media files
Learn about Locate and organize your iTunes media files
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Jul 26, 2013 1:42 PM in response to dhillappleby sterling r,Hello dhillapple,
I think I would start here with this article named Troubleshooting iTunes for Windows Vista or Windows 7 video playback performance issues found http://support.apple.com/kb/ts1718.
If that troubleshooting doesn't resolve the issue, then I would suggest creating a new iTunes library with this iTunes: How to open an alternate iTunes Library file or create a new one http://support.apple.com/kb/ht1589 and then downloading a few of the videos with this Downloading past purchases from the App Store, iBookstore, and iTunes Store http://support.apple.com/kb/ht2519 to it to see if the issue persists.
If the issue does not persists in the new library then I recommend recreating your iTunes library.
iTunes: How to re-create your iTunes library and playlists
http://support.apple.com/kb/HT1451
If the issue does persist in the new library then I would use this article to help isolate whether or not it is system wide or user specific.
Isolating an issue by using another user account
http://support.apple.com/kb/TS4053
All the best,
Sterling
