HT1926 Every time I try and download iTunes it says that iTunes Script is invalid

I tried updating iTunes and it wouldnt work so I uninstalled every apple program on my computer and everything else has installed except iTunes. When it's almost done installing, something pops up saying that iTunes has an invalid signature and cannot be downloaded.
Help me fix this!!

Every time i try to download it, it says i have insufficient access to bonjour and to log in as administrator and i am logged in as the administrator.
What's the precise text of the error message, please? (There's a couple of different ones I can think of that you might be getting.)

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