Win8.1 prompts "No audio output device is installed"

The Win8.1 system uses the process to suddenly have no sound, uses the troubleshooter automatically detects that prompts "does not install any audio output device". But you have already plugged in the headset, why do you have this hint? Here's how to solve this problem.

　　The method is as follows:

1, from the desktop win+r;

2, enter "regedit" to open Registry Editor;

3, with the editor to find, search "Audiosrv", with the whole word matching;

4, the inside of the requiredprivileges behind the corresponding data data inside the next two delete, only retain SeChangeNotifyPrivilege.

5, finally restart the WIN8 system can be.