ITunes audio/video drifts out-of-sync

I have for a while been having problems with watching videos I have downloaded from the iTunes Store on my PC. I'm running windows 7, all my drivers are up to date, and the videos play fine if I open them up in Quicktime. If I watch them in iTunes, however, the audio and video get out of sync rather rapidly... If I watch a show in iTunes, I need to pause and restart it every 30 seconds or so, otherwise it just becomes too annoying to watch. Clicking pause then play again syncs it back up, but again it doesn't last long. I open the files in Quicktime and they play just fine, and considering iTunes just uses Quicktime for video playback, the problem must be with iTunes. I have gone through several iTunes updates, hoping with each one that the problem gets fixed, but it never does... can anyone help me??

Also been experiencing this for some time now, win7 x64 and same sort of pc specs to all you guys, fixed it just this evening so hopefully it's not just a fluke!
Two things to do, first in quicktime preferences, audio tab, under the sound out field, rate change too 44.1khz, size to 16 bit and make sure channels matches you windows default. Now you need to make sure your audio driver software matches these settings (as that is the software that controls the sample rate and bit depth in shared mode); mine is realtek HD audio manager, so for anyone else who has that, go to the default format tab make sure it is '16bit, 44100hz (CD Quality)'.
I'm not a big expert on this so I can't say why itunes suddenly has a problem with these settings or why it makes a difference, I just hope that this fix works for you as well because I have been looking for a solution online forever and it's driven me insane!
Good luck!

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