Try the steps here:
and let us know the exact error message you are getting.
If your itunes is on a laptop then its possible to bring that and your ipod into an apple retail store. Make a reservation first:
Hope this helps.
The exact error message I am getting is: "The ipod "Honora Keane's ipod" cannot be synced. The required disk cannot be found."
Any ideas. I found the steps listed above to be easy to follow, but only got to #2! thanks. Nora