How to install iTunes - failed installation

Before another problem occurred, I had iTunes installed and running. Afterward I had to re-install some other programs and iTunes and Quicktime, too. However, when I tried to reinstall iTunes and Quicktime (several different times, too), I had the installation to stop and this message appeared - ["Installation failed. Reinstall iTunes again. Error Code: -3"]
However, an icon for iTunes and Quicktime had been placed on the desktop but when they were clicked, this message appeared:["Failed to initialize Error Code: #634443]
I have tried both to update and to install stand alone programs. Also, I tried removing each only to have the message that they could not be removed because some files were missing.
Can you help me get iTunes and Quicktime installed and running? Thanks.

hi VRS!
However, an icon for iTunes and Quicktime had been placed on the desktop but when they were clicked, this message appeared:["Failed to initialize Error Code: #634443]
i'm following up on some weird (and rare) possibilities with the messages you're receiving.
did the original problem (that caused the reinstallation of itunes and the other program) involve or result in any major changes to the Registry on your PC?
do you have more than one user account on that PC? if so, go into the other user accounts and try to launch itunes and QT. (don't try any installs at the moment.)
do you find that there's one account in which you can get itunes/QT to launch, but in the others you can't?
love, b

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