I'm experiencing a problem with my iPod nano. a few days ago it stopped responding, and showed a message on its screen that told me to restore the iPod using my iTunes. When I connect the iPod to my computer (a PC, not a Mac), iTunes identifies the need to restore it. I instruct iTunes to restore the iPod, but a few seconds after the restoring process starts, iTunes informs me that "The iPod "iPod" could not be restored, An unknown error has occured (1418)". What am I to do?