Some customers using the iPod shuffle (Second Generation) on a Windows 2000 PC may see an error (-50) alert when trying to add or remove music from the iPod followed by an alert message stating that the iPod needs to be restored:
This symptom may be cause by an older version of iPod software installed on the iPod shuffle. To resolve this issue, restore and update the iPod shuffle to iPod shuffle software 1.0.1 or later as described in the following article:
300701: "Restoring iPod shuffle to factory settings"