The sound volume icon in the lower right corner of the win7 system desktop is missing.
1. Click on the "start” menu to find “run" in the attachment and open it (you can also use the key combination) :Win+R), then type “services.msc” in the run box and click “OK" button;
2. Find “windows audio" in the "service" window This double-click to open it;
3. Under the "General" tab, change the startup type to "Automatic" and click the "Start" button in the service status.
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