Sound Disbaled in Windows 10

[MBKITMGR]

Windows 10 Ver 10.0.17134.48


I have a Dell Latitude laptop that since installing updates in April 2018, and the latest release a few days ago, has the sound disabled.


Hardware diagnostics shows the hardware is ok, booting from a LIVE distro of Ubuntu has sound working ok. Thinking it was initially the sound device (realtek) I purchased a USB sound device. Windows goes thru the motions of installing the device driver, but it too does not respond with sound


Symptoms

• Sound icon in Systray is marked as muted
• Windows Audio and Windows Audio Endpoint Builder services are both running
• If I run "Troubleshoot sound problems" from right clicking the sound icon in Systray, it responds with "An error ocurred while troubleshooting" "An unexpected error has occurred. The troubleshooting wizard cant continue". Doing this generates an error in the event log Source = Application Error, Id = 1000, Category = (100) Faulting application name: sdiagnhost.exe, version: 10.0.17134.1, time stamp: 0xf19a53e3
  Faulting module name: AudioDiagnosticUtil.dll, version: 10.0.17134.1, time stamp: 0xa1e1eba3
  Exception code: 0xc0000005
  Fault offset: 0x00000000000011e4
  Faulting process ID: 0x14cc
  Faulting application start time: 0x01d3fd657a14e0dc
  Faulting application path: C:\WINDOWS\System32\sdiagnhost.exe
  Faulting module path: C:\WINDOWS\TEMP\SDIAG_aac461cc-7ad3-43ba-b053-417c464d7a88\AudioDiagnosticUtil.dll
  Report ID: 3aee12ee-30f4-42d9-a527-e2394b953da1
  Faulting package full name:
  Faulting package-relative application ID:
• Device Manager for both the on-board sound card and USB sound cars say the device is working properly
• I have removed the device drivers for both, and allowed them to reinstall without any change in behviour
• I have downloaded drivers from Dell for the Realtek
• Tried the steps in Fix Sound Problems

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