Problem with multiple XP accounts since installing new version of iTunes/QT

I am running XP Pro. A year or so ago, I went through the "disaster" recovery of installing the new version of iTunes (5.0) along with its nasty QT upgrade that was not ready for prime time. After much thrashing, I got my computer back to iTunes 4.9.0.xx and an older version of QT.
My son just bought a shuffle this week and so we thought it would now be safe to get the latest version of iTunes/QT on our machine. Boy, were we wrong.
We loaded, logged into my account, iTunes 6.0.4 and QT 7.1.0. iTunes comes up in my account and it recognizes my mini still.
However, iTunes will no longer run in my wife's account (she has a mini and has had it longer than my mini) and will not work in my son's account for his shuffle. It brings up the error dialog about QT not working.
My wife went to her account and just tried starting QT and it gave an error saying it was not installed properly.
I would have expected the installation in one account to work for all accounts given where it is installed.
Any help would be appreciated.

hiya!
even though you're not getting a #6344x in the affected accounts, this is still looking consistent with a registry permissions issue on the PC. (1402s have been known to be associated with the "stops working in all-but-one pre-existing account after an upgrade" issue before.)
the stejskal family pioneered the treatment for us:
the trick for me was getting up the nerve to "fiddle" with the registry...the reason why the girls could not get access to iTunes/QT was down to permission...once I got one going I went back in to HKEY-MACHINE\SOFTWARE\apple computer, inc\Quicktime...click to highlight go to edit, permission and added the missing girls to the list of who is allowed...made sure they have full permission..apply, ok and "bobs your uncle" all is now well in stejskal home.
http://discussions.apple.com/thread.jspa?messageID=810602&#810602
so check to see if those user accounts that are crashing for you have the right permissions on those keys.
keep us posted.
love, b

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Problem with multiple XP accounts since installing new version of iTunes/QT

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