Windows Media Error

Under Windows 98SE I keep getting ‘Playback Engine: Media Jukebax is unable to Acquire Licence for this file. Windows Media Error: 0x80070020’. Now the music files are all from a purchased CD then riped to my system. When I get this I hit ‘OK’ it goes to the next song and starts to play. Now if I stop the next song I can go right back to the error song and play it. Why is this happening?