HT5485 Why wont the update of itunes install? it keeps saying the signature is invalid, what should i do?

someone please help me, i cannot update me ipod until this updates!!

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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