I can't run Itunes! After installing Itunes, I receive a message saying that Windows could not verify Apple's digital signature and it closes.

Pls HELP me! I can"t install it Itunes on any of my computers. After downloading it ( Run now or Saving it) it will no run because I keep receiving a message saying that Windows can not open this file because it could not verify Apple's Digital Signature. I have changed my internet security settings to allow downloads from unverified websites but it will not allow me to run Itunes. I had an older version of Itunes so I tried to install the update and it wouldn't work because so the same message about not being able to verify the digital signature.  I uninstalled Itunes and Quicktime and all other Apple programs on my system. Then I tried to download it again... no luck the same message came up again. I then went to my other computer that NEVER HAD ANY APPLE software on it and tried to download Itunes. It gave me the same message. Please help me, I'm going crazy tring to figure this out.

I had this same issue occur today during update, searched and finally tracked to problem with windows registry. Used online version of windows registry tool "Fix It" (can also download portable version for offline check. I selected Apple updater utility from list to fix and it did it's thing. Returned to my downloaded 10 iTunes adn isntalled perfectly fine.
http://support.microsoft.com/mats/Program_Install_and_Uninstall
Good luck. Worked for me back up and running.

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