HT1349 I get an invalid signature message when trying to upgrade iTunes. How do I fix this?

How can I I'd the invalid signature when trying to upgrade iTunes on my PC?

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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    Runtime Error
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    Try the following user tip:
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