Stuttering and skipping audio, and an accidental QuickTime workaround

Hi,
I've been having periodic problems with skipping and stuttering audio since the 10.5.6 or 10.5.6 update to OS X. Lately, it's become worse. Just about all of the audio on my system, except for Flash, stutters and skips. I visited the Genius bar at the local Apple store yesterday, and he had never seen anything like it, and suggested an archive and install of the OS, which I'm not quite ready to jump to yet. So this morning, I decided to post my problem here, and I thought it would be a good idea to make a recording of my audio problem so people would know exactly what I was talking about. Since this problem also exists in iTunes, I decided to open a QuickTime Audio Recording window while I had a particular audio file playing in iTunes repetitively. So I had the audio file playing, with its stuttering and skipping, and I opened the QuickTime Audio Recording, and waited for another skipping and stuttering occurrence. To my surprise, the skipping and stuttering stopped! I let the same audio file play for about 20 minutes, and it played perfectly. Also, while the QuickTime Audio Recording window was open, all of the other sounds (alert sounds from apps, etc.) played perfectly. When I closed the Audio Recording window, the audio problems came back! So the good news is that I've apparently found a workaround to my problem. The bad news is that I still don't know how to fix it properly. The Apple Genius suggested that I download and reinstall QuickTime, which I did, but that didn't solve the problem. I have a feeling now that this problem is related to QuickTime in some way. I'm wondering if anyone can offer additional suggestions as to a fix for this. When I right-click on an audio file and select the "Open With..." option, among the choices are three QuickTime versions, 7.5.5, 7.6, and 7.6.4, which make me think that there might be leftover components from older versions of QuickTime on my system. Is there any way that I can do a "clean" install of QuickTime that's more thorough than just a download and install?
Thanks,
Ken

Hi, QuickTimeKirk,
You asked an interesting question, and here are the results;
When I tried to open a file with QuickTime 7.5.5, it opened, and the About box reported that it was indeed QuickTime 7.5.5.
When I tried to open a file with QuickTime 7.6, the QuickTime menu options briefly appeared for 1-2 seconds, and then disappeared. After this, I couldn't find any indication that QuickTime was running, neither by cmd-tabbing nor by looking at the processes in Activity Monitor.
And QuickTime 7.6.4 opens fine, and is listed as the default app for opening this particular audio file.
Here's some more info. I did a Spotlight search on "QuickTime", and it found two versions of the QuickTime app. Version 7.6.4 was in the Applications folder of my system drive, and Version 7.6 was in the Applications folder of a 10.4.11 installation that I have on another partition of the same drive. I found no listing for a 7.5.5 app, but when I looked again at the 7.5.5 About box, I saw the following:
QuickTime Player
Version 7.5.5 (249.24)
Quicktime(tm) Version 7.6.4 (1327.73)
Copyright (c) 1989-2008 , Apple Inc.,
All Rights Reserved
Is this normal, to have two different versions listed for a single instance of QuickTime?
Thanks for your help.
Ken

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