TS1389 "Invalid Signature" when downloading the Itunes update - how do i fix?

i get a message "Invalid Signature" when downloading the Itunes update - how do i fix?

Hi Antosydney,
Thanks for visiting Apple Support Communities.
The steps in the "Additional Troubleshooting" section of this article can help with the message you're receiving:
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
Cheers,
Jeremy

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