Crackling sound after updating to Itunes 10.2.1 on Windows 7 Laptop

I recently upgraded to Itunes 10.2.1 on my laptop. Ever since this update, I have been getting a crackling sound whenever I play audio or video.
I know its not my Bose Companion 5s because I don't get this problem with VLC player or Windows Media Player. Its really annoying because I can't play Itunes movies or shows on those players and have to sit through the crackling sound.
Anyone else have this problem? Anyone got any solutions for this? Thank you for your help.

DO you by any chance have Norton?
I have seen one report that was associated with an unspecified Norton product. If so it might be worth briefly disabling it to see if that makes a difference.
Also I have seen one report of skipping rather than crackling associated with continuous backup.
Here is the Apple help on play back problems in case you haven't seen it:
http://support.apple.com/kb/TS1362
Message was edited by: polydorus

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