I am having major problems with the latest update for my itunes!

I am having problems with the latest update for itunes, it says 'itunes has an invalid signature'. I have completely uninstalled itunes but now it wont download at all. Have tried downloading it 4 times tonight already. Anyone know how to get it to download? Or what to do?

I am having problems with the latest update for itunes, it says 'itunes has an invalid signature'.
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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