OK, so I'm giving y old iPod nano away, and I have a Mac. the person I'm giving it to has a PC, and when I plug the iPod in to his computer, it won't pop up. I plugged it in while holding down the center and menu button to put it into diagnostics mode, and the computer recognized it as "software that could not be installed". I tried this many times, what is the trick to this?!? Any help is appreciated, thanks.