As there are many versions of the Realtek AC97 driver
and codecs, could you give moe specific details?
Go to Start > Run, and type msinfo32. then expand the Components tree and choose a device
Go to Control Panel > Device Manager and look for any entry that has a yellow flag beside it.
The chipset info is really what we need
supports all ALC series audio chipsets
from ALC101 up to ALC861. It is used as onboard sound on many motherboards. Chips
covered include ALC101/201/202/203/250/650/653/655/658/861