Method one, volume control can not be opened due to the loss of file Sndvol32.exe, open My Computer, and then follow the path "C:windowssystem32" See if there are sndvol32.exe files, if not, we can another computer to copy one over, or from the Internet to download a, but must be antivirus oh. Then restart the computer should be OK.
Method Two, using the right mouse click on my Computer, and then select the "Management" option, then, in the pop-up interface, we select "Services and Applications" >> "Services" >> "Windows Audio", and then we start it, or restart, As shown in the figure:
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Method Three, click on the beginning of the lower left corner of the computer, and then select the Control Panel options, then select the sound and video devices, and then in the pop-up window, we click the Volume button, and then put the volume icon in front of the taskbar tick, as shown in the picture: