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)


    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

    Posts : 2,067
    Windows 10 Home/ Windows 10 TP/ Windows 8.1 Pro/ Windows 7 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

    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)

Similar Threads
Thread Forum
how do turn windows defender on.x
I have recently bought a new laptop and the free months trial of mcafee is due to end in 2 days time I have been told to turn on windows defender but if I click on it it just says defender is turned off everywhere I have looked for help just says to click on it and click settings but there is...
System Security
How to turn on Windows Defender
Hi Guys I'm using Win 8 Pro and following some advice on another thread I went to check my Windows Defender via 'all apps' When I click on it I just get the following message........... "Windows Defender has been turned off and it isn't monitoring your computer" I've tried a few things...
System Security
Windows Defender Won't Turn On
I'm running 8.1. When I try to run Windows Defender through services (since it is set to manual and turned off), I get the following message: Windows could not start the Windows Defender Service service on Local Computer. Error 577: Windows cannot verify the digital signature for this...
System Security
Cannot turn on Windows Defender
Hi guys! I'm new to the forums (first post) so please be kind, haha! I have recently built a PC myself and had no issues whatsoever, until the other day when an Action Centre notification popped up. For some reason, Spyware and Virus protection have both turned off automatically and when I am...
System Security
Can not turn Windows defender on ....?
Hi All Oops .. I got it .. Have to turn it from Action center . Thanks .
System Security
how to turn windows defender on again
cannot turn on windows defender. just get message box saying turned off.
System Security
Windows Defender will not turn on
I've spent more than two hours on trying to fix this mess. I did several fixes that did not work at all. It was working last night then I decided to refresh my PC. I installed several programs including drivers, windows updates and Malware Bytes (No Anti-virus installed). Today, I found out...
System Security

Eight Forums Android App Eight Forums IOS App Follow us on Facebook