QuickTime will not reinstall on my home desktop

Somewhere between April 27, 2011 and last week something happened to the Quick Time installation on my home desktop and now I cannot get it to reinstall.
Pentium IV class processor
Vista Home Premium
iTunes (latest version) installed
When I try and reinstall Quick Time I get this error message:
Insights on getting this squared away will be apprecited.

Re, what else is not working? iTunes is also locking up, which I attribute to some connection to the Quicktime issues.
Yeah ... although the connection is a bit more hazy nowadays, given that a full version of QuickTime no longer needs to be installed for iTunes to work.
I'm not sure why a QuickTime install would need to do anything with those files. But let's try taking the message at its word and see if we can make some progress that way.
Download and save a copy of the QuickTime installer to your desktop. (Don't run the install just yet.)
Configure the PC to start with a clean boot as per the following document:
Perform a clean startup to determine whether background programs are interfering with your game or program
Restart the PC. Don't open any applications. Try an install.
Does that go through any better?

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