platcentre is the creative software for their cards which would indicate you have a creative sound card
they produce a number of cards and specific drivers for each card
so you need to know which one you have
have a look on the card
AC'97 is an onboard sound chip and being as you have a asus m/b you can get the driver for this from asus by going to the download page for your specific m/b
http://www.asus.com/products.aspx?l1...11&modelmenu=1
you put your m/b details in the search box on the left and search for your m/b then go to the d/load page