Quicktime will not install to Windows Vista "could not open key..."

I have been trying to install Quicktime for some time.
Get error message: "Could not open key: UNKNOWN\Components\9c430...... Verify that you have sufficient access to that key, or contact your local support personnel." The installer then rolls back.
I kept trying and was able to install QT, but it would not open. Error messagesaid something about a "side-by-side" configuration.
I am the only user/administrator of this pc. I have tried all troubleshooting steps on this website, including uninstalling all Apple software and all remnants.
I tried all troubleshooting steps. My next step is to re-install Windows.
HP d5000t Windows Vista Vista Ultimate 64-bit, Intel core2 quad Q9450 @ 2.66GHz 8GB RAM

Get error message: "Could not open key: UNKNOWN\Components\9c430...... Verify that you have sufficient access to that key, or contact your local support personnel." The installer then rolls back.
Doublechecking, Alex. Have you tried the procedures from the following post?
http://discussions.apple.com/thread.jspa?threadID=2475687&tstart=30
(Although that's about an iTunes install problem on 7 rather than QuickTime install problem on Vista, similar sorts of troubleshooting proicedures can apply in your circumstances too.)

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Quicktime will not install to Windows Vista "could not open key..."

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