Itunes was unable to load data class information from sync services -problem syncing iphone with itunes

Hi I have windows 7 and itunes 11.1.1. I recently got a new iphone 5s and have tried to sync and the above message came up and itunes becomes non-reponsive. I tried my old iphone 3gs and the same thing happened. I have tried reinstalling itunes, installing a previous itunes version (although this did not work-again got another error message), tried to choose preferences to reset sync history but itunes becomes non-resonsive before I can do this. Have tried the other options in http://http://support.apple.com/kb/TS2690 but still not working...any ideas? Cant work my new iphone :-( Thanks

A quick cursory browse seems to point that the problem is on Apples end since the last update of iTunes, theres loads of forum posts about it but Apple themselves arent responding as yet other then the usual "unplug, delete sync data, reconnect or completely uninstall iTunes" spiel which doesnt work so hopefully they will fix it sooner or later

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    See TS2690: iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert.
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    A quick cursory browse seems to point that the problem is on Apples end since the last update of iTunes, theres loads of forum posts about it but Apple themselves arent responding as yet other then the usual "unplug, delete sync data, reconnect or completely uninstall iTunes" spiel which doesnt work so hopefully they will fix it sooner or later

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    Error message missed off previous post - "iTunes was unable to load data class information from sync services"

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    Hello Human1234,
    Thanks for using Apple Support Communities.
    To troubleshoot Sync Services with Outlook and iTunes, please follow the troubleshooting in the article below.
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    http://support.apple.com/kb/TS2776
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    http://support.apple.com/kb/TS2690

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