Please, close all applications that can capture your camera (Skype, WebcamMax, Discord, Zoom, Microsoft Teams and others).

 

For this you need:

1. Open the Task Manager Windows (Ctrl+Shift+Esc), tab "Processes".

2. Choose the program by clicking from the list.

3. Click on button "End Task":

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If the procedure was successful, the program should disappear from the list of processes.