ITunes/QuickTime on Windows 7 - HD Playback Stutter

I can't seem to properly playback HD video files in iTunes or QuickTime without the whole file stuttering.
System Specs:
Core i7-920
6GB RAM
80GB Intel SSD
1TB Western Digital Black HDD
nVidia GTX 460 768MB
Windows 7 64-bit
iTunes 10.4.1.10
Quicktime 7.7
So, I have a system that has more than enough horsepower to play the files. I watch Blu-ray discs on the system all the time.
The files themselves are actually Blu-ray rips of my own movies that I encoded with Handbrake to the Apple TV 2 format. (H.264, Low Complexity, 720 resolution)
Weird thing is that I can play the same files on my iPhone 4, iPad 1, Apple TV 2 with no problems at all. My computer has more capability than all of these devices put together. My CPU usage is at about 15% during playback.
I can play the files just fine in Windows Media Player 11.
I've also tried playing the files back on a 32-bit Windows machine with the same result.
I had a similar issue a while back when trying to play HD Podcasts from Revision 3. I got frustrated and went back to the non-HD versions after a while.
I'm perplexed on this one.
Any ideas?

Just to follow up.
I did a little more research/testing. I played the same HD file (Blu-ray rip) on my 2011 MacBook Air in QuickTime and it played perfectly. I was in OSX Lion when I played the file.
If you asked me, it's looking like there is some kind of problem with QuickTime for Windows. Because I believe that iTunes is still using QuickTime to play video files.
I would still like to hear from anyone else if they have any ideas.

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hi Keith!
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try to open your QuickTime. does it launch properly, or do you get an error message?
if you get an error message, the first thing we'll try is a careful standalone QT 7.1 reinstall.
download and save a copy of the QT 7.1 standalone installer to your hard drive. (we'll run the install from there rather than online.) switch off antivirus and antispyware applications prior to the install.
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if that install goes through okay, does your itunes launch properly again?
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http://www.apple.com/itunes/download/
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In you're start menu there should be a "Command Prompt" shortcut, click it. If not don't worry, on your start menu click "Run" and type in:
cmd.exe
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cd
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