How To Start Dell Webcam When I Start Webcam Manager It Says "failed To Start Video Preview. Please Reconnect Your Camera"?

When i start webcam manager it says "failed to start video preview. please reconnect your camera"? - how to start dell webcam

Dell Inspiron 1525 with built-in webcam, the type of laptop have. but my camera is also integrated?? to connect idk good as new. Please help!

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