Itunes missing required files - even after installing quick time 7

PLEASE help- i have been having so much trouble with itunes lately.
first of all, i can't open itunes because " some of its required files are missing."
so, i reinstall itines with newest version of quick time 7.
when setting up itunes after this installation, a pop up box tells me that "Quick Time installation failed. Error Code: -3"
so, i go to click on itunes 'just to check' and the same "missing files' message appears yet AGAIN.
someone please tlel me what do to next.
i'd greatly appreciate your help!

Hi there,
I have exactly this problem, and I have tried to reinstall the standalong QT, it still does not work. But nevertheless, try this:
http://www.apple.com/quicktime/download/standalone.html
cheers,
Ipodrc

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Itunes missing required files - even after installing quick time 7

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