"iTune was unable to load data class information from sync services"  what can I do?

I am getting this error message everytime when I cannot my iPhone 4 and syncing to iTune.
Can anybody advise me what to do. Plzzz..
I also cannot back up my iPhone with iTune.

Doublechecking. You've tried the following troubleshooting document?
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert

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