1. First click on the start of the win7 system, and enter the “regedit” command and press Enter to open the registry;
2. In the open registry editor, navigate to: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesAudiosrv;
3, then find and double-click the "DependOnService" option, in the window that opens, delete the “MMCSS” in the value data box, and then save and exit the registry.
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