The first error msg I got was this:
"The installer has insufficient privileges to modify this file: C:\Program Files(x86)\iTunes\Acknowledgments.rtf"
A Google search turned up this page, which was helpful:
But I quickly discovered that the problem isn't just one file. As soon as I change permissions on one file, the error msg is replaced with another - it seems to be going down the list of most, or perhaps all, of the iTunes files.
Going through the list and claiming ownership of every file individually would be unbelievably time-consuming (not to mention tedious). Does someone have a clue about what's happening and/or an efficient way to fix this? I'd be grateful beyond words...