There is no generic AC'97 driver. One must install their motherboard chipset driver and then the sound driver for the AC'97 implementation that board used.
Sorry to see you omitted machine/board details or I would have tried to supply which 2 drivers I would have tried.
Suddenly,it seems I have lost my Audio.
I have tried Troubleshooting and have uninstalled and re-installed Realtek AC'97. I have downloaded the latest Driver for this hardware. Device Manager confirms that Realtek AC 97 is present. When I go to"Install new Hardware I get a message "WINDOWS CANNOT LOAD THE DEVICE DRIVER FOR THIS HARDWARE. THE DRIVER MAY BE CORRUPTED OR MISSING CODE 39"
In my ignorance I am suspecting a Hardware problem ( new Sound Card required?) but someone might have a simpler explanation, for which - again in this Forum- I would be truly grateful.
I am running XP Home with SP2