1.    28 Mar 2017 #1
    Join Date : Mar 2017
    Posts : 83
    Windows 10 Professional

    Clean Boot Troubleshooting Caused Windows Defender 0x80070426

    I tried to do a clean boot to see if it would allow my system to sleep : Desktop computer refuses to sleep when logged in - - Windows 10 Forums

    After that failed as a troubleshooting step (my system still would not sleep while idle), I tried a diagnostic startup. Upon re-enabling, I was greeted with a dialog stating that Windows Defender was unable to start with error code 0x80070426. I tried sfc /scannow, which found some corruption. I fixed that with a DISM RestoreHealth (step 7), but I still had the Windows Defender error upon startup and Defender does not start if I try to open it manually (I get the same error).

    Re-enabling all services and startup programs does not fix the Defender issue, either.
      My ComputerSystem Spec
  2.    28 Mar 2017 #2
    Join Date : Aug 2016
    S/E England
    Posts : 4,526
    10 Home x64 (1709) (10 Pro on 2nd pc)

    Where sfc /scannow and DISM fail, the next step would be the in-place repair install. It may cure your sleep problem too.

    This tutorial will show you how to do a repair install of Windows 10 by performing an in-place upgrade without losing anything.
    Repair Install Windows 10 with an In-place Upgrade
      My ComputersSystem Spec
  3.    28 Mar 2017 #3
    Join Date : Mar 2017
    Posts : 83
    Windows 10 Professional
    Thread Starter

    Quote Originally Posted by Bree View Post
    Where sfc /scannow and DISM fail, the next step would be the in-place repair install. It may cure your sleep problem too.

    Repair Install Windows 10 with an In-place Upgrade
    Yep, that's what I ended up doing. I've done several repair installs since encountering the sleep issue. It unfortunately does not do the trick. For a long time, I had a batch schedule for putting the system to sleep, but that started acting weird due to some strange inconsistencies with Task Scheduler, e.g. telling it to only run between certain hours and still having it run outside those hours.
      My ComputerSystem Spec


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