Problems downloading latest version

Im having trouble downloading itunes latest version on my computer.
It keeps coming up with an error - invalid itunes signature.
What does this mean & how do I fix it?????

It suggests that the installer is getting damaged during the download.
Try updating your iTunes using an iTunesSetup.exe (or iTunes64Setup.exe) installer file downloaded from the Apple website:
http://www.apple.com/itunes/download/

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