HT1926 Down loaded ITunes latest version,but intallation did not complete.Error message  "invalid signature"

Upgraded my iTunes to the latest version(pc),it downloaded  the new version but stopped during intallation.error message "invalid signature"

That suggests 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/quicktime/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

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