This did the trick! Many thanks for sharing.I seem to have found a fix that so far has been working for me.
Go to the control panel/System and Security/Find and Fix problems/Hardware and Sound/Configure a Device.
Then click Next and go through the process. Mine said it found a problem with a device, and fixed it, and then I rebooted. After that, the camera worked fine and is still working. Seems like it honed right in on what was keeping the camera from turning on and fixed it.