I am trying to update iTunes but it says I have an invalid signature

I want to update my iTunes but half way through it errors out and says I have a invalid signature. How do I fix this?

Download the Windows Installer CleanUp utility from the following page (use one of the links under the "DOWNLOAD LOCATION" thingy on the Major Geeks page):
http://majorgeeks.com/download.php?det=4459
To install the utility, doubleclick the msicuu2.exe file you downloaded.
Now run the utility ("Start > All Programs > Windows Install Clean Up").
In the list of programs that appears in CleanUp, select any QuickTime entries and click "Remove", as per the following screenshot:
Quit out of CleanUp, restart the PC. Now try another QuickTime install. Does it go through properly this time?

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