ITunes audio lag

I recently bought a new computer (less than a month and a half ago), running Windows 8, and installed the latest version of iTunes and Quicktime (iTunes 11.1 and Quicktime 7.7). My computer is hooked up to a small HD TV monitor using an HDMI cable. I bought an HD movie throught the iTunes store yesterday, and played it through iTunes. However, the audio and video will quickly become out of sync, usually within about 15 seconds. I have updated my NVIDIA disply driver and also my audio driver (IDT audio driver), to no avail. I have also made sure that my computer audio playback is set at 16 bit/44.100 hz, and that iTunes audio playback is also set at 16 bit/44.100 hz. No of this has helped. I will play the video, and within 10-15 seconds the audio is lagging horribly behind the video.
I have also tried to play the movie in Quicktime by clicking on the movie in iTunes, showing the movie in windows explorer, and then clicking open with Quicktime. However, when Quicktime opens, it just sits on a grey screen. I click play, and the timer for the movie starts, but the screen just stays grey the whole time. My Quicktime audio playback is also set at 16 bit/44.100 hz, for what its worth.
I have literally spent an entire day trying to look up a solution for this problem, and have found absolutely nothing that has helped. If ANYONE has an idea of what I can do to alleviate this problem, please let me know. I am at a total loss to figure this out. I am somewhat familiar with computers, enough to run through some basic fixes, but I am by no means a computer whiz. I have also contacted Apple about this problem, and got back the typical response of "update my drivers etc etc etc." It seems like nothing on the Apple website has instructions for possible remedies to this for Windows 8, so as I said I am at a total loss. ANY HELP WOULD BE APPRECIATED!!!!

demand a refund, I had this same problem 6 months ago...gave them another shot recently and apple still hasn't fixed the problem

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Hello jksilva92,
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http://support.apple.com/kb/TS1362
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Thanks for using Apple Support Communities.
For more information on this, take a look at:
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http://support.apple.com/kb/ht1420
To authorize a computer, follow these steps:
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Choose Store > Authorize This Computer from the menu bar.
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If your Apple ID uses an expired MobileMe account, you can still authorize your computer.
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ITunes audio lag

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