Can not sync my iPod. Can not find a specific folder. What do I do?

I want to sync my iPod. Connect iPod to your computer, the iPod says that is not sinhronezatsiya otklyuchaye device, I go to itunes, the iPod loading to remove the device from the computer and the computer screen when sinhronezatsii some time out two windows: "Can not sync iPod" iPod ". can not find a disk," and "Can not sync iPod" iPod ". can not find the folder you want." What do I do?

Restores the system also writes.