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Audio output device not installed in Windows 10, 8 and Windows 7 — what to do?

Audio output device not installed in Windows 10, 8 and Windows 7 — what to do?Among the many faults with the equipment and in particular with the sound in Windows is possible to meet a red cross on the sound icon in the notification area and says “audio Output device not installed” or “speaker or earphone is not connected” thus to fix this error is often necessary to work hard.