I am getting "invalid signature" error when i try updating itunes. How do I fix?

I received a notice that an update was available for itunes. I went through the installation
process and then near the end an error message came up telling me that it would not be installed
because of an invalid signature I tried doing this again only manual this time and the same thing happened.
I have never had this happen before. What is the problem? How do I fix?
Thanks, JKay

Twanger317,
Have you tried to do a repair install on the pc of iTunes? Also if that does not work i would follow these instructions on removing iTunes and reinstall. http://support.apple.com/kb/HT1923 for windows vista and 7 and http://support.apple.com/kb/HT1925 for windows xp. let me know if that helps.

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