If you are having issues with video playback in iTunes, the following article will assist depending on which version of Windows you have.
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Thanks for the links. I use Windows 8 but was okay making the sytem changes up until modifying the system drive configuration. I found the IDE ATA/ATAPI controllers but there was no plus sign and I was unable to find the properties. Unfortunately the changes I'd made to that point had no positove effect on my problem.