The solution to the problem that the system volume icon cannot be opened is: 1. Open the local service list; 2. Find the User Manager service item and double-click to open it; 3. Change the startup type to [Automatic]; 4. Click [Start] button to start the service.
1. Press the win r shortcut key to open the run window;
2. In the run window Type "services.msc" in and click [OK];
3. Find the "Windows Defender Firewall" service item in the service list and double-click to open it;
4. In the pop-up window, switch the startup type to "Automatic", and then click the startup button;
5. Restart Go back to the service list, find the "User Manager" service item, double-click to open it;
6. In the pop-up window, change the startup type to "Automatic" and click Start That’s it.
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