"Files shared by these updates" has invalid signature.  It will not be installed

Any help on this is appreciated.
I figure the problem is now the reason way my Itunes closes down after four songs?
First things first.  I need help before I move to a more simple music provider.

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
tt2

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