That is not your motherboard model number.
The model will be something like this K9MM-V or P4MAM2-V (these are examples so you will know what to look for).
To find your board model, download, install, then run Belarc Advisor
When the scan finishes, you will receive a report of your system. Look at the section Main Circuit Board, next to Board will be the model number. This is what you will need to use when looking for the audio drivers.
Is your system custom built or an off-the-shelf system? If it's off-the-shelf, what is the make and model? You may be able to find the driver you need at the computer manufacturer website.
Finally, while still looking at the Belarc report, is there a device name under Multimedia, and if there, what is it?