Put the speaker volume control icon back on the Taskbar:-
To place the volume control icon back next to the clock, follow these steps:
1. Open the Control Panel from the Start menu.
2. Click the Sounds Speech and Audio Devices icon. (Or, depending how your
Control Panel is set up, click the Sounds and Audio Devices icon.)
3. Click "Adjust the system volume."
4. Click in the box marked "Place volume icon in the taskbar."
5. Click the OK button, and the little Speaker icon appears next to the
clock, where it should be.