Windows 10: Clean Boot Troubleshooting Caused Windows Defender 0x80070426

Discus and support Clean Boot Troubleshooting Caused Windows Defender 0x80070426 in AntiVirus, Firewalls and System Security to solve the problem; 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... Discussion in 'AntiVirus, Firewalls and System Security' started by Xilnik, Mar 28, 2017.

  1. Xilnik Win User

    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.

    :)
     
    Xilnik, Mar 28, 2017
    #1

  2. 0x80070426 error code while Windows Defender update

    *Original Title: 0x80070426 error code

    to open and update windows defender in windows 10, i receive 0x80070426 error code!

    what can i do?
     
    leilijalili, Mar 28, 2017
    #2
  3. Rick Dizy Win User
    Issue Opening Windows Defender

    Hello,

    I get error code 0x80070426 when I try to open Windows Defender via Update & Security on Windows 10 home.

    I have tired

    1. Restart your PC

    2. Remove existing antivirus and antispyware software

    3. Scan your PC for malwares

    4. SFC scan

    5. Clean Boot

    6. Restart Security Center Service

    7. Delete conflicting Registry Entry

    8. Enabling Windows Defender from Group Policy

    I have also tried running the Troubleshoot Windows Update service and the Dism tool.

    Is there anyway someone could help analyze the log files from Dism and/or Sfc?

    Thanks,

    Rick
     
    Rick Dizy, Mar 28, 2017
    #3
  4. Bree New Member

    Clean Boot Troubleshooting Caused Windows Defender 0x80070426

    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
     
  5. Xilnik Win User
    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.
     
    Xilnik, Apr 5, 2018
    #5
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Clean Boot Troubleshooting Caused Windows Defender 0x80070426

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