After plugging the headphones or loudspeakers into your computer, be sure that the volume is turned about halfway and that the microphone is not on mute. You can then adjust the volume so that it is comfortable for you.
The Windows system allows you to place an icon in your system tray bar (this is the small collection of icons at the bottom right corner of your screen, next to the time display; ). You can click on it once to bring up a control to quickly adjust your system system volume (or mute volume).
The way how to obtain this icon differs between the different Windows systems, the version of Windows you are currently using is given in the grey square:
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