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When the computer disappear familiar, commonly used labels, the situation is not pleasant. Indeed, in this case disrupted the usual mode of operation. And if the label has disappeared for inexperienced users – there can be quite a problem. But as they say, desperate situations does not happen. At least, the following ways will help to solve your problem.
The simplest way is to click the right mouse button on a clear part of the taskbar and go to Properties. In the opened new window you can enable and disable system icons. Look in the table under "Volume", and then in the right window pane in the column "Behavior" from the context menu select "Insert". Returning the icon to the toolbar, you can configure the sound settings, use the mixer to adjust the level of sound, to give different sound effects.
To return the volume label to system tray is possible by enabling the "Node universal PNP-devices." For this you need to open the "Computer". Then find the 'Manage' section from which you can navigate to the folder "Service and application". Open "Services" and activate the option "Node universal PNP-devices." In the properties, specify the startup type to automatic and start the service.
You can try another restore option icon. To do this, the menu "start", go to "control Panel". In this section you will find the subdirectory "Sounds and audio devices" and the tab "Volume" and tick "Show volume icon on taskbar".
If these methods do not help, try to clean temporary files and cache system settings. For this approach, for example, CCleaner. Run the program, click on "Cleaning Windows". Then select "System" and check "Temporary files, file Fragments" and "Other - outdated sampling frame cache region of notification, other files and folders". Clean. Then deleted missing from taskbar icons will have to return to the site.