I got a message saying that Microsoft Digital Media Server Module has been installed. I looked it up, and all I can find is what the latest version number is. So, what is it for?
It's a virtual device used for streaming digital media out to devices on the network. It gets installed and setup when you enable media streaming via Windows Media Player 12.
If you want to get rid of it, disable media streaming and then in Device Manager -> Digital Media Devices, Uninstall Microsoft Digital Media Server Module.