|Go to Device Manger and see if there are any errors showing (usually small red or yellow icon). If so it might give an idea what device is the problem. My guess is that the camera driver needs re-installing, if so get the latest from MS. It could have got itself corrupted somehow.|
You could also consider System Restore to before this happened, although as first attempt at fixing the issue it is a bit like using a sledge hammer to crack a nut.
Always pop back and let us know the outcome - thanks