Cannot play iTunes video in QuickTime ("computer not authorized")

A few weeks ago I found a work-around to the vide/audio out-of-sync issue with iTunes 10, and that was to play videos through QuickTime, which I was able to do. Until today. Now QT won't play videos, saying the computer isn't authorized. I go to iTunes, authorize the computer (over and over and over) and QT still won't play. Then when I play the video through iTunes, I have to authorize it the video again and then it begins playing (but of course, video/audio will eventually become out of sync as always...). Any ideas on why QT won't play the videos now or what is making it believe this computer is not authorized? I've de-authorized/re-authorized, I've changed User Account Controls and deleted an "SC" file (the latter two were part of an Apple (un)solution found here ). I'm still at a loss and frustrated beyond belief.
I'm running Windows 7 Home Premium, 64-bit

I have the same scenario too, running Windows 8.1 on my HP Pavilion p7-1007c Desktop PC. However, as I found out, a few iTunes purchases can be fully played on QuickTime for Windows without warning.
Apple should update QuickTime for Windows as soon as possible in order to correct this iTunes authorization bug.

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On your Computer... Open iTunes...
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Cannot play iTunes video in QuickTime ("computer not authorized")

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