QuickTime for Windows - version incompatibility with Safari 5.1?

This issue involves a Dell Laptop running Windows XP Pro, SP3.
I installed Quicktime and iTunes, and both were functioning fine.
I then installed Open Office, a couple of Windows security updates. and then Safari 5.1
Immediately after the above installations, neither QuickTime nor iTunes could play mp4 video, and QuickTime could not play m4a or mp3 audio.
I made the assumption that it must have had something to do with Open Office, or perhaps Safari 5.1.
I completely uninstalled all Apple software on the PC. I then installed Open Office and QuickTime, in that order.
QuickTime once again could play both mp4 video and m4a or mp3 audio.
I hoped that I had fixed the problem.
However, immediately after installing Safari 5.1 once again, Quicktime again could not play video or audio.
The time pointer moves in real time, but there is no audio, and video shows a new frame every 2 seconds (approx.), but no sound.
The QuickTime version is 7.6.7.
Is there an absolute need to install the "Safari + Quicktime" installer to avoid this type of issue? My main computer is a Mac, and I'm pretty sure
I've updated Safari on occasion w/o first installing the latest Quicktime. Perhaps the issue is more complex with Windows.
Thanks for reading

If you have Private Browsing enabled, that's why you aren't staying logged into websites. Same with Google maps.
Private Browsing doesn't "remember" AutoFill information.
Click History in the menu bar then click: Clear History

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