If what you want to save is on the iPod look at iRip and read how to use it BEFORE you plug in the iPod.
There are now so many ways to purchase that I can't guess why it's not in your iTunes Apple account. You may have to ask them. But iRip is something folk use to get tunes from pods to the iTunes library.
Time to start a backup/restore system?
so my laptop got a virus a few months ago and I reinstalled the OS and iTunes as well. however the music files that downloaded with the updated iTunes did not include all of the music I purchased. I still have all my songs on my ipod nano and they also show up on a separate pc that belongs to the "home sharing" group of iTunes. however I don't really use that pc and want all my tunes on the laptop. ive searched my c drive but those music files are gone. how can I recover those songs onto my laptop. I understand that I need to reinstall music from cds but these songs were purchased. I did try to download available from I tunes store but it didn't include all my music for some reason. any help appreciated.