ITunes won't download- "invalid digital signature"

I'm trying to download the new version of iTunes. It starts to download fine, but at the very end, a box comes up and says that windows has cancelled the download because of an "invalid digital signature" and then just x's itself out. How can I solve this problem?

BigChap posted this reply ealier - it worked great for me.
right click on Internet Explorer on your desktop and choose Properties/advanced and check the box "allow software to run or install when signature is invalid".
hit Apply. then close Internet Explorer and restart. got to download site and choose "run" instead of "save". worked for me after dozens of other attempts failed

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