You ship these PC's out with MCE on them. I am sure I saw them on your website before it gave me a virus.
What bios version do you use?
Do you use HDMI?
What are your bios settings?
Do you have an additions to MCE to make it work with the MSI Media Live?
We have not shipped the MSI Media Live for more than 9 months now I'm afraid. But when we did ship systems based on it we did have audio working over the HDMI connector.
Re the virus you mention - apologies for that if it came from our site. We did have a brief outage last week but you are the first person that has reported anything to us. Our site has been completely reinstated now and is definitely clean now.
All the best