HT4623 TRying to update iphone 4@ to ios 7. Get message in itunes "unable to load data class information from Sync services. Reconnect or try again later." That has not worked.

Corporate issued iphone 4S. Trying to update to ios 7. I tunes not recongnising the phone, and I get this message:
"itunes unable to load data class information from Sync Services. Reconnect ot try again later."
I have disconnected from itunes several times. The phone is dead, as if it was brand new.
I get "slide to setup" and then connect to wifi, which works, but nothing after that, just above message.

Hello there, scott_arrow.
The following Knowledge Base article offers up some great information for your particular message:
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert
http://support.apple.com/kb/TS2690
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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http://support.apple.com/kb/TS2690?viewlocale=en_US&locale=en_US

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Try here:
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert
If not successful see the previous discussion on the right side of this page with the green checkmark.

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The article says that I should upgrade to the latest iTunes. I am on the latest iTunes version.
If you could read just a tiny little bit further, under the "Additional Information" section immediately after that, it says:
If you are still experiencing this issue when syncing, or have not installed Xcode 4 and get this alert:
Follow the troubleshooting steps in Mac OS X v10.5, v10.6: Resetting the SyncServices folder.
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Have you tried those measures?

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Try here:
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert
If not successful see the previous discussion on the right side of this page with the green checkmark.

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Running around the house whilst pulling my hair and yelling obscenities
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Start with the article below for troubleshooting syncing issues with Sync Services.
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http://support.apple.com/kb/TS2776
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-Norm G.

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Try here:
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert
If not successful see the previous discussion on the right side of this page with the green checkmark.

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See:
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert
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HT4623 TRying to update iphone 4@ to ios 7. Get message in itunes "unable to load data class information from Sync services. Reconnect or try again later." That has not worked.

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