Problems installing the latest version of itunes, I've tried everything!

hello,
I logged into my itunes a few days ago and clicked yes to upgrade to the latest verion. Ever since then, itunes will not open, I get a message saying 'itunes has encountered a problem and needs to close'
I have searched through the support site and tried every single thing it has suggested and I still have the same problem.
I have uninstalled then reinstalled itunes and quicktime, I have done a system restore, I have tried all the suggestions.
One thing I did notice when I last reinstalled itunes, when I clicked on it, it said that quicktme was not installed, so I installed it and it won't open either. There is no error message, there is nothing, it just won't open up.
Can someone please help!

One thing I did notice when I last reinstalled itunes, when I clicked on it, it said that quicktme was not installed, so I installed it and it won't open either. There is no error message, there is nothing, it just won't open up.
focussing on the QuickTime situation at the moment. (the issue with the QuickTime is probably causing the itunes issues.) these are some preliminary questions aimed at focussing in on possible culprits.
try heading into your Control Panel and launching your QuickTime control panel. does it launch, or do you get an error message? if you get an error message, what's the precise text of the error message?
try uninstalling QuickTime again. does it uninstall successfully? if not, do you get an error message on the uninstall? if so, what does it say?

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