I use windows media play 9. I just started getting the above error message and music won't play. I have followed the instructions given in other threads on this subject including downloading the 814129 patch from Microsoft. Still the problem persists. I can see .avi videos but no sound. This applies to mp3s on my system and cd's which I insert in the drive. The .asx is correct. I have removed and reinstalled the media player 9 program, rebooted, etc. What else to try? Thanks.