Error message when syncing Ipad in itunes: unable to load data class

Hi there:
I t tried posting this question on the ipad community but no luck.
What happened last night I was trying to sync/backup my ipad 2 running ios 5.0.1 with itunes 10.5 (?) for over an hour.  It stuck on step 2 of syncing ipad and it's been on that for a while.  when I get to step two, after it asks me if I want to sync my purchased on my ipad to itunes, I click ok.  then i keep getting the follow error message: itunes was unable to load data class information from Sync services.  reconnect or try again later.
I keep trying and this message keeps popping up on step two;
then in itunes when I click on my ipad under devices, itunes will freeze.
I can't figure out what happened.  when I previously synced I had no problem and it was quick.
I even tried to download itunes again and "repair" it but still same problem.
Please help.
thanks

In the course of your troubleshooting to date, have you worked through the following document, Jeff?
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert

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