OS X Yosemite application cannot be opened

I just updated my MAC to OS X Yosemite.  I am the "administrator" and my daughter has her own account.  Everything is running super-smooth on mine.  I went to update her iPad to the Mac and we logged into her account and when we went to open iTunes, it said, "Application iTunes cannot be opened".  Okay, fine - no biggie right? So I went to trouble-shoot through Safari and it said, "Application Safari cannot be opened".  Frustrated, I clicked on App Store and guess what it said? Yup.
So, I logged back into my account and repaired disk and tried again...to no avail.  I'm not ignorant on a Mac, but I'm not a pro on it either.  Any help would be greatly appreciated because we can't access anything in hers and I check privacy settings under my account and nothing looks out of shape.  I literally cannot access anything if I log into hers (System Preferences even gives me the same error!).
Thanks in advance!
~Nicolette

Found the solution with this thread : Software Update - No update available
and this link : https://gist.github.com/erikng/f315409c9f0f42c1659a

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