HT1222 Wheb I try to update iTune I am getting a message "the site has not a valid signature" and the downloading is stopped. How can I fix IT?

Wheb I try to update iTune I am getting a message "the site has not a valid signature" and the downloading is stopped. How can I fix IT?
I am using windows 7 64

That suggests that the installer is getting damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

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