Unfortunately, with the information you provide, it would be impossible to find a driver for you.
DDR 400 is referring to the speed of the memory you motherboard takes, not the model number.
I you could provide the exact model of your motherboard and/or the exact sound codec along with your operation system we could probably point you at the right driver.
Looked at the Motherboard and all I can read is that it is an:
Asrock AGP 8X .
The sound board is aC media AC97 .
I have formatted my HDD. But have no drivers for the motherboard. I have downloaded the drivers for the sound Board ( at least i think so). The sound still does not work so I am having an en-exucated guess it is the main board drivers that are missing?
Any help would be greatly appreciated