annoying error ...

when i try to open itunes i get a pop-up that says "the application cannot be opened. the required folder cannot be found." even though i have the AppData folder on my computer. i have tried to uninstall and re-install quicktime and itunes but when i do i get a pop-up that says " could not access network location %APPDATA%\".

is there anything i can do to fix this?

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Orignal From: annoying error ...