:Please refer to below steps to reinstall Realtek HD Audio driver:
1.Enter into "Add or Remove Programs" and remove "Realtek High Definition Audio Driver"
2.Disable all "Microsoft®
UAA Bus Driver for High Definition Audio" in Device Manager first
3.Then uninstall all "Microsoft®
UAA Bus Driver for High Definition Audio" from the system.
5.Reinstall "Realtek HD Audio driver" from Motherboard Support CD.
If you still meet this problem, please reinstall fresh Windows®