I downloaded and installed the codec, and tried the VLC player, but the plot thicken's. While I no longer get the "missing codec message," I discovered the computer has no audio at all. This mess started when I was looking for a virus. I was able to find and remove the virus (actually 3 malware issues) but in the process I wiped out the audio. I built this machine a number of years ago. The motherboard is a Asus Intel Socket 775 P5LD2-VM SE, and it has on board audio (Real Tek HD ). I found and down loaded the audio driver and apparently installed it, but I still get no sound from the computer. I used Malwarebytes to find the malware, and ran PC Tools Registry Mechanic in the process of removing the malware. I had to run "regedit" and change the registry because the CD Drive wouldn't show up when I went "My Computer." Sorry to be so long winded, but I want to pass on all the information possible.