device mixer

I'm using a asus p5gc-mx/1333 motherboard, and ive attempted to install the Realtek AC driver that i got from the packed driver, to no effect, ive tried to install it 3 times and I still don't have sound, ive already tried to download from asus site but still not working..
my speaker is working and it has sound when opening and during shutdown .. but when in my media player error message appear and it say device mixer missing....
at the moment im clueless as where to get the driver or how to get my sound to work. Any help would be appreciated.
thanks god bless and more power!!

My operating system is Windows XP professional , service pack 2

LOL lately, i delete it and uninstall it from device manager unfortunately when i reinstall the realtek in mboard cd an error appear during installation .. it says INSTALL REALTEK HD AUDIO FAILURE..

 

is it ok if i keep installing the chipset from motherboard cd?

do ASUS P5GC-MX/1333 has the latest chipset in the net?

Thanks God Bless

 

thanks halo for the info to install the latest update from the asus site my sound devices is now working...
:major