Are you sure you have the correct drivers for Vista and that the device is compatible with Vista? Just because it works on XP is no guarantee it will work on Vista (especially if you are using XP drivers). What is the manufacturer, make, and model of mp3 player? What version of Vista are you using?
Please answer these questions in your reply. Also check with the manufacturer for updated drivers, firmware, and/or software compatible with both your device and your version of Vista and try installing them and see if that makes any difference.
Thank you. I look forward to your reply with answers and any progress you made with the drivers.
Good luck!
Lorien - MCSE/MCSA/Network+/A+ --- If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.