Solution 1: First check to make sure that your hardware is actually compatible with the version of Windows you are using. You can find out this information in the documentation that came with it. Alternatively, use the manufacturer's website.
Solution 2: If your MP3 player works on an earlier version of Windows, but not on a more recent version, then check on the manufacturer's website to see if there is a firmware update to fix this.
Solution 3: Make sure your version of Windows is up-to-date and has the latest Service Pack installed. Ensuring your operating system is up-to-date can sometimes fix a compatibility issue.
Solution 4: Try setting the portable player to use a different USB mode if the unit supports it:
- Disconnect your portable from the computer.
- Look in your portable's settings to see if you can select another USB mode -- such as MTP mode.
- Connect the portable again to your computer to see if it is now recognized.
Solution 5: Tweak the USB power management option. To do this using Device Manager:
- Hold down the [Windows] key and press [R].
- Type: devmgmt.msc in the run box and hit [Enter].
- Look in the Universal Serial Bus Controllers section by clicking the + next to it.
- Double-click on the first USB Root Hub entry in the list. Click on the Power Management tab.
- Clear the box next to the Allow the computer to turn off this device to save power option. Click OK.
- Follow steps 4 and 5 until all the USB Root Hub entries have been configured. Restart Windows and try to sync your portable again.