I can't synch my Ipod touch.

Is this when you are trying to use iTunes U? If not, this forum is for questions from those managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. You'll be most likely to get help with this issue if you ask in the general iTunes or iPod touch forums.

Regards.

http://support.apple.com/kb/TS2690

iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert

and this previous discussion

https://discussions.apple.com/thread/4091118?tstart=30