P4s5a Sound Problems After Installing Windows XP Pro SP2

Well, i decided to reinstall windows, and install Windows XP Pro with
SP2, and now sound doesn't work (on board sound). I try to install the
drivers throught the CD installer, and doesn't work. I went to the
official site of the motherboard, downloaded the official drivers and
it still doesn't work. I try to install by going to the device
manager, there is the yellow question mark (?) on the multimedia audio
controller, I choose to reinstall the controller, then I manually
choose the drivers for Windows XP on the corresponding folder Winxp
that came with download, and says that the file doesn't contain
anything bout the hardware I'm trying to install. Its SiS 7012 Sound
Driver. I tried other sites and still doesn't work.
Any help would be apreciated.
Thank You.