Windows 8 and 8.1 Forums


Defender won't open in windows 8

  1. #1


    Posts : 7
    Windows 8.1

    Defender won't open in windows 8


    Hi I am having the problem of Windows defender not opening. In the action center it says it is on. What I'm having issues with is clicking on the defender icon and nothing happening. It just won't open. I want to run a full scan, but I get nothing. Any help would be appreciated.

      My System SpecsSystem Spec

  2. #2


    Posts : 22
    Windows 8.1 Pro 64-Bit


    What happens if you try to open it from the Control Panel?
    Does it say 'This app has been turned off and isn't monitoring your computer'?

    Also, in the control panel again, check the 'Action Center' to see if there are any messages for antivirus options for Windows Defender.
      My System SpecsSystem Spec

  3. #3


    Posts : 7
    Windows 8.1


    Even in the control panel I click on it and nothing happens. It just sits there.
    In the action center I have

    Windows firewall-on
    Windows update-on
    virus protection, defender-on
    spyware, defender-on
      My System SpecsSystem Spec

  4. #4


    Posts : 22
    Windows 8.1 Pro 64-Bit


    Try turning it off and then on again from the Action Center to see if that helps.
    Or turn it off, restart machine, turn it back on, restart machine - try again?
      My System SpecsSystem Spec

  5. #5


    Posts : 7
    Windows 8.1


    How would one turn it off through the action center? I don't seem to have an option.
      My System SpecsSystem Spec

  6. #6


    Posts : 22
    Windows 8.1 Pro 64-Bit


    How about if you go to C:\Program Files\Windows Defender - it is 'MSASCui.exe'
    Does it open through that.
      My System SpecsSystem Spec

  7. #7


    Posts : 7
    Windows 8.1


    Hmm No it doesn't, but the file MSASCui.exe does not have the.exe extension on it. Could that be the problem?
      My System SpecsSystem Spec

  8. #8



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


    Do you have 'hide extensions for known file types' checked?

    Click image for larger version
      My System SpecsSystem Spec

  9. #9


    Posts : 7
    Windows 8.1


    Okay so it does have the .exe. :-) It still does not open from there. I tried to run as admin, but it just asks if it wants me to allow it to change and then again does nothing after I click yes. I'm trying to update itunes at the same time and it's not working either. It keeps telling me I'm not the admin, which I am.
      My System SpecsSystem Spec

  10. #10


    Posts : 7
    Windows 8.1


    I opened my laptop in safemode and there windows defender is no where to be found. I'm so confused now.
      My System SpecsSystem Spec

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