In order to fix the issue, press Windows + R key combination, type devmgmt.msc and click OK. Expand the Universal Serial Bus Controllers and Imaging devices lists, select the webcam driver and click the Delete key. After that, reboot your computer, press Scan for hardware changes icon from Device Manager and wait Windows to retrieve the drivers. If it still doesn't work, navigate to your webcam developer's page and download and install the latest drivers and software for your webcam model.