1. Launch the Control Panel
2. Double-click Sounds and Multimedia
3. Click on the Hardware tab
4. Select the AC'97 Sound Card
5. Click Properties (not Troubleshoot)
6. Click on the Driver tab
7. Click on the Update Driver button. This will start the Update Device Driver Wizard
8. Select Search for a suitable driver for my device...
9. In the optional search locations, make sure the Microsoft Windows update checkbox is selected.
10. Click on the Next button. The search will take a few minutes. Continue with the install of the new drivers found. It appears that Microsoft has elected to replace the AC drivers with SoundMAX Integrated Digital Audio drivers.