Well..then you need to know what board it is...

go to the board manufacturer and see what sound card it is...and see if the board manufacturer has a drive...or use google to find the driver

Usually you get some documentation with your computer...it should be in that

Other then that you may need to pop open the box...and look for the model\manufacturer stamped right on the board.

I havent been successful with generic sound card drivers....they seem to be very picky

MLF