I am trying to update i Tunes to new version i get a message saying iTunes has an invalid signature and will not install.Any help please.

I am trying to update iTunes to new version .
When it goes to install i get a message saying iTunes has an invalid signature and will not install.
Any help please.

Go directly to Apple link to download
http://support.apple.com/kb/DL1426
Select "Save" instead of "Run".  Once downloaded, double click the iTunesetup.exe to install.

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