Sound very choppy and out of sync on videos. Fine when playing music

Whenever I try to play a video on iTunes I must use quicktime instead because the Audio makes it so unbearable. It becomes choppy and delayed by a few seconds. It almost pulses.
My audio is fine when I try to play music and fine on quicktime.
Anyone got any idea???
Thanks

Did you ever get an answer on this?  I have the exact same problem.  Windows Vista, iTunes 10.5.3.3
Songs play great, videos are choppy and warble but they play fine on QuickTime.

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