Take your FULL motherboard name (like MSI MS-xxxx or something - you can find it on the packaging of the motherboard or on the motherboard itself) and google for it. Or go directly to the MSI homepage and find the DRIVERS part. It should contain all releated drivers (if your soundcard is integrated into the motherboard)
Well, If you can get us the make and full model I am sure that someone can help you..
I did a short lookUp of msi 7173 mother board, But didn't find much.. It seems that the
MSI 7173 board is used by Gateway..See if you can get a little more info on this board.