ITunes 10.7.0.21 choppy audio playback

After upgrading my Windows 7 PC to iTunes 10.7.0.21, the audio is incredibly choppy. I cannot do anything else on my computer without the sound going haywire. It only plays smoothly if iTunes is constantly on top. I can't even simply type a web address in to Chrome without the audio chopping up. This is incredibly frustrating as I had no problems with the previous iTunes version. I attempted to revert to the old version but it just gave me the error that it could no longer find my library. HELP!

I'd like to add to this. Since I upgraded my iTunes, my videos (from my iphone) no longer plays properly. It just plays a syllable out of the video, and then loops it over and over. When I play that same video in Windows Media Player, it ofcourse does not recognize the format, but will play the audio flawlessly.
When I play my movies in iTunes, it does not have audio but the video is flawless.
This issue also persists whenever I play these videos using Quicktime.
Help!
I have Windows XP service pack 3, 1.86 GHz processor, 1.49G RAM.

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ITunes 10.7.0.21 choppy audio playback

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