I cannot update/download iTunes v. 11.x.x

I cannot update iTunes through Apple Software Update (nor Quicktime). I get an error "iTunes (Quicktime) has an invalid signature". When trying to download from the apple website, I get "This program is not commonly downloaded and could harm your computer". I'm running Windows 7 that is current with updates, and have the latest version of Apple Software Update. I have had problems with updating/downloading anything Apple for a bout a year, but there was always an easy fix. As of now, there no longer is a quick fix that I can find. Anybody have anything other than what I have already seen that doesn't work?

Morning Scotthrpster,
Thanks for using Apple Support Communities.
Issues installing iTunes and QuickTime are successfully resolved a majority of the time after completing these troubleshooting steps.
Take a look at this article:
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/ht1926
Best of luck,
Mario

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http://support.apple.com/kb/SP575
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http://www.apple.com/osx/specs/
If you are outside the US call your national Apple Helpline:
http://support.apple.com/kb/HE57
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iTunes for Windows: "Error 7" message when opening iTunes
http://support.apple.com/kb/TS3074
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I cannot update/download iTunes v. 11.x.x

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