the sound device is integrated in the south bridge, in this case named mcp (short for media and communications processor. add the extension -d if the chip offers dolby digital decoding).
drivers for your micro-star board are supplied by either nvidia via internet or your boardīs vendor via cd-rom, being labeled 'nforce unified driver package'. follow
this link to find the latest official release of these. dunno about the cd-rom tho, sry m8e! guess youīll just have to check the boardīs installation manual and the cd-roms that comes with it. good luck & chk 6, pilot ;))