Alrighty then. First, download and install
this program and make sure that iTunes is NOT installed on your computer. If you have iTunes and you plug the iPod into your computer, it will automatically sync with your library. And since you have no library, all the music on your iPod will be deleted. After you've downloaded and installed PodUtil, plug your iPod in your computer. The computer should only recognize the iPod as a portable hard drive. Open PodUtil, and it will display a list of all your playlists and music.

Select a directory to copy your music to by clicking "Choose" at the bottom of the PodUtil window.

After that, click "Copy" and wait for your music to be copied.