Why are certain sound files not playing correctly in iTunes?

I have had iTunes for years and have never had prolonged or unsolvable problems with anything playback related until now. I recently acquired some music, and it plays perfectly when I use WMP. When I added it my iTunes library, however, the audio is compressed during playback and there is a lot of skipping and blips going on in every song. It still plays perfectly in WMP, but not matter what I do the same thing happens in iTunes.
For reference, here is what the original audio songs like
http://picosong.com/cNPn
And here is what it sounds like in iTunes
http://picosong.com/cNPe

I have a similar problem. When I try to play TV episodes that were downloaded (in .m4v format) using iTunes, QuickTime (7.0.4) will play video without audio, and when I press "stop", QuickTime locks up!
My system used to play these files PERFECTLY, until I downloaded some shareware video format conversion programs (that didn't work, anyway). I believe one of them installed a shared DLL or CODEC or something that is conflicting with QuickTime. I'VE UNINSTALLED AND REINSTALLED QUICKTIME AND ITUNES COUNTLESS TIMES, trying to follow different people's advice, mostly from posts on this site, but nothing helps!!
The thing we have in common is that it sounds like you also have other video software that could have conflicting CODECs or shared DLLs. DOES ANYBODY KNOW HOW TO TRACK THIS PROBLEM DOWN??
And why doesn't Apple make a CLEAN uninstaller and a COMPLETE installer? People shouldn't have to do the manual registry editing and file deletions that other people are recommending!!!!!
Intel 915 Mo Bd. 3.2GHz 1G RAM Windows XP

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I have a similar problem. When I try to play TV episodes that were downloaded (in .m4v format) using iTunes, QuickTime (7.0.4) will play video without audio, and when I press "stop", QuickTime locks up!
My system used to play these files PERFECTLY, until I downloaded some shareware video format conversion programs (that didn't work, anyway). I believe one of them installed a shared DLL or CODEC or something that is conflicting with QuickTime. I'VE UNINSTALLED AND REINSTALLED QUICKTIME AND ITUNES COUNTLESS TIMES, trying to follow different people's advice, mostly from posts on this site, but nothing helps!!
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And why doesn't Apple make a CLEAN uninstaller and a COMPLETE installer? People shouldn't have to do the manual registry editing and file deletions that other people are recommending!!!!!
Intel 915 Mo Bd. 3.2GHz 1G RAM Windows XP

Why do certain .mpg files not play in Quicktime?

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Thanks for your reply, I ran it through Media Info. Here are the results:
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1 Video stream: MPEG video
1 Audio stream: AC-3
First Video Stream:
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Please let me know where to go from here. Thanks so much!
Date: Fri, 11 Nov 2011 10:50:15 -0700
From: [email protected]
To: [email protected]
Subject: HELP....AVCHD / MPEG files not playing correctly!
    Re: HELP....AVCHD / MPEG files not playing correctly!
    created by Ann Bens in Premiere Pro CS4 & Earlier - View the full discussion
Welcome to the forum.A screendump of what these SD files exactly are would be very nice.Run them throught Media info.http://mediainfo.sourceforge.net/en
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Why are certain sound files not playing correctly in iTunes?

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