1
If there is no privacy slider on your webcam, I presume you have enabled permissions for the webcam in the Settings App - Privacy & Security - Camera, if so, then check the Function keys on your keyboard, if one has a camera icon on the key, try pressing that key or Fn + that key to see if that gets the webcam working.
2
If not,
A
Open Device Manager, expand the Cameras section, please provide a screenshot of that full Device Manager window.
B
Click your Start Button, then just type msinfo and press Enter, please provide a screenshot of the resulting System Information window.