I'm having a problem updating the iTunes software. Receiving "invalid signature". Does anyone know how to fix this?

Hi Everyone,
I have been trying to update iTunes, Safari, and Quicktime. Keep receiving "invalid signature" and then it removes the attempted download. Does anyone know how to fix this?

I have had this happen as well. What I had to do was sync the iPod to remove the album and the resync the album back to the Classic. I've had this happen with my iPhones as well. Must be a bug in either the current OS or iTunes versions.

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