Windows 8 and 8.1 Forums


Windows Defender went off & won't turn on (8.1)

  1. #1


    Posts : 1
    windows 8.1

    Windows Defender went off & won't turn on (8.1)


    Hi,

    Running Windows 8.1 on Dell XPS bot last fall. Have been running Windows Firewall and Window Defender from the beginning.

    Last week, "Solve PC Issues" notifications on bottom bar indicated Windows Defender turned off. Clicked the "Turn On Now" button. Got following pop-up message:
    An error has occurred in the program during
    initialization. If this problem continues please
    contact your administrator. Error code 0x80073b01


    Went to control panel > system and security > action center. Same message in notifications. Clicked "Turn on Now" from there - same result. Also tried to turn on as administrator (I am the moron administrator). Same result.

    I never ran another anti virus program on this computer. None are listed among programs for deletion (maybe one came with, but I don't see it and never activated it). I did not ever turn off Defender. I do have the Spybot free program installed, but that has been on since beginning of February with no problems, and I think it only runs manually when I do a scan (it is more anti-malware I think, not full always running anti-virus).

    Suggestions? Help? (Please). Thanks, Lazlo

      My System SpecsSystem Spec

  2. #2



    BSOD Kernel Dump Analyst
    Posts : 2,274
    Windows 10 Pro


    As far as I have checked the error could be an infection.
    Have you tried a third av program or any anti-malware programs?
      My System SpecsSystem Spec

  3. #3


    Canada
    Posts : 1,950
    windows 8.1 Update 1 Pro 64bit


    The Error code means ERROR_MUI_FILE_NOT_LOADED

    Windows key + X, select Command Prompt (Admin) and type sfc /scannow

    When completed type DISM /Online /Cleanup-Image /RestoreHealth

    Then rerun the sfc command again, reboot and see if Defender is working.
      My System SpecsSystem Spec

Windows Defender went off & won't turn on (8.1)
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