iTouch: restoring music

If they're still on your PC and you remember the folder they're in, just import them again using iTunes. To import all the audio files in a folder, choose File > "Add Folder to Library," and then locate the folder containing the music you want added to your library. The My Music folder (inside the My Documents folder) is often the default location for files imported using other applications, such as MusicMatch.

If this doesn't work and the music is still on your iPod Touch, try going into Windows Explorer and drag & drop (copy) the files back onto your hard drive.

i use ipod smart backup.