One feature that iTunes offers you is to restore the iPod. Restoring the iPod is a slightly misleading name in that restoring actually means deleting all the content on your iPod and starting over.
Restoring your iPod is sometimes the only way to do what you want (like use your iPod on multiple computers or on both a Mac and a PC) or to solve some difficult problems. This is a step-by-step guide on how to restore the iPod.
NOTE: Before you restore your iPod, though, make sure everything on your iPod is backed up somewhere else.
Start by syncing your iPod with your computer. When you do this, the iPod management screen will appear. Midway down that screen there's a button that reads "Restore."