My downloads of iTunes and related software onto my Windows PC fails every time with error message that the software does not have valid signature.  How to get around this problem?

I have trouble downloading iTunes software and related software like the new ios8 on both my desktop--Windows 7, and my laptop--Windows Vista, because I keep getting error messages saying the software has been deleted because invalid signature.   I have tried download and install and I have tried just download, but neither method works.   So I am stuck with the older software and my new iPad 2 Air isn't connecting because I need ios8 apparently.
I have an iPhone 5 and a new iPad 2 Air.
How to get around the Windows problem, please?
Thank you!

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