The camera must be in use by a program that you did not open, such as a background service. Background services can be found in the system tray or processes in task manager, and are installed with your programs and devices (such as a webcam) They almost always get in the way, so download ccleaner and click on tools, then startup, to toggle these services (be careful not to toggle ones you know you use or need), but find services like un needed camera software and shut them down. Reboot.
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