After updating to windows 8.1 iTunes does not think I have high definition display. Playback with other internet apps is in high def, but not iTunes.

I updated to Windows 8.1 from Windows 8.  Now when I try to play high definition movies, iTunes says they can not play back on my display which is low def.  My display has high resolution and display settings are correct.  Other websites play back in high def.  Just not iTunes.

Hi,
Try this command to fix your problem:
Windows App Store doesn't load after 8.1 Upgrade
http://blogs.technet.com/b/ouc1too/archive/2013/10/19/windows-app-store-doesn-t-load-after-8-1-upgrade.aspx
or, you can use WSreset.exe tool, or manually trying to clear the cache from the Windows\SoftwareDistribution\Download folder.
Alex Zhao
TechNet Community Support

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