[_Odyssey]

Hi, If you have the disc that came with the player, install the programs from it and format it from the Mp3 Disk Tool.. or... another way that works for me is plug the mp3 player into the computer, right click on the icon in My Computer and select Tools > Format Disk

This has happened to a friend while she was using Windows Media Player. It's really a Microsoft issue. Windows Media Player sync is usually not the best way to put music on your player. Just create your folders, and copy and paste your music from your hard drive to your mp3 player.