Audio begins lagging behind video in iTunes; other video works fine

Something that appears to have started after iTunes 10.x as I don't normally play too many videos on the PC from iTunes is regarding video playback in iTunes. The longer a video plays the longer the lag between what's showing up on the screen and the audio portion. If I stop and start the video it starts off synced again and then begins lagging. If I go outside of iTunes I can play other video formats such as wmv, avi, with no trouble, DVD and BluRay playback are not affected. The video files from iTunes play fine on my iPad. I can see no obvious cause for this, any help or suggestions would be greatly appreciated. I have a decent high end PC running Windows 7 64 bit, with a quad core i7 processor, 6 GB of RAM, a terabyte of disk space, and an ATI 4870 HD video card.
Thanks much!
Chris

I'm having the same problem. As I play ted podcast, the video starts lagging behind audio, and the longer I play, the more pronounced the effect. As I pause, video and audio re-synchronize.
iTunes version:10.5.3.3
CPU: x5675
GPU: gtx 570
RAM: 24GB ecc supp
OS: Windows 7 64 bit Ultimate
Codec pack: K-Lite
Motherboard: p6x58-e
Sound Card: Asus Xonar Essence STX
Let me know if I can provide any information to help you fix this, it is very annoying

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Audio begins lagging behind video in iTunes; other video works fine

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