My friend has deleted her music from her PC by mistake. Her music is now only stored on her iPod. She wants to plug the iPod in and have the music copied back onto her PC and have iTunes working as it was before she deleted anything.

She brought her laptop in and I checked the 'don't automatically sync' option (if I don't it will just wipe the iPod won't it?)

But as I have no iPod and have never used iTunes I'm not 100% sure how to do what she wants. Can anyone recommend a way to get this back as it was?