Choppy mp4 playback in iTunes

Until tonight, I've never had issues with video playback in iTunes. I have a library of mp4 video files that I've played successfully in the past with little or no video quality issues.
All of a sudden, none of my videos will play correctly in iTunes. The video is incredibly choppy, with a new frame or two playing every 30 seconds while the audio plays relatively normally. If I open the same file in another player (VLC or WMP), the file will play correctly with no choppiness. In fact, I can play the video file in both players at the same time with zero quality loss, so there's no lack of computer power that would cause this in iTunes. To the best of my knowledge, nothing changed on my system to prompt this - I was literally in the middle of watching a video when it happened.
After experiencing this issue, I upgraded iTunes, Windows, and my video card drivers to the latest versions/drivers (rebooting several times in the process), but this did not help. Next, I followed all of the instructions in the relevant support document (http://support.apple.com/kb/TS1718), also to no avail.
For the heck of it, I rented an HD movie from the iTunes store and had the exact same problem. I originally thought that this might be an issue with my media, but it is clearly not.
I often stream video from my PC to my AppleTV, and this is also experiencing the exact same choppy video (as you would expect).
I have no clue what else to try. I would prefer to watch the videos in another player, but this is sadly not an option if I wish to continue using my AppleTV. Has anyone else experienced this (or a similar) problem? I'm at my wits' end, and very unhappy that I spent so much time transferring my video library into iTunes. Nothing substantial changed on my computer that should have caused this, especially not in the middle of watching a movie. Any help or further ideas would be greatly, greatly appreciated.

Solution: format computer because iTunes is terrible. Problem "solved," I guess

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