Windows 8 and 8.1 Forums


windows defender not scanning on its own

  1. #1


    Posts : 16
    windows 8

    windows defender not scanning on its own


    I have windows 8.1. I am running windows defender cause its built in and the paid version of Malwarebytes Anti-Malware. The problem I'm having is windows defender updates and says it running properly but it won't let me set an automatic system scan. I get a pop up from the windows notification screen once a week saying I need to run a system scan. Just wondering what the problem is and how to fix it? I thought they were different software ruling out them clashing with each other.

      My System SpecsSystem Spec

  2. #2


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


    Windows Defender and Malwarebytes cause no conflicts.
    Should you wish to schedule Windows Defender differently see this tutorial:
    Windows Defender Scheduled Scan - Set Up in Windows 8
      My System SpecsSystem Spec

  3. #3



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Attachment 55752
    Does it look like this in Action Center under security or does it show Malwarebytes. The premium version is an Active protection and not just an on demand scanner.
      My System SpecsSystem Spec

  4. #4


    Posts : 16
    windows 8


    cliff s: yes my action center looks like that.
    nuccii: when I try to set the scheduler following that link I get task license validation incorrect.
      My System SpecsSystem Spec

  5. #5


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


    Do you still have a 3rd party antivirus trial version installed still on your computer, if you do use their removal tool.

    Run sfc /scannow in an elevated command prompt.
      My System SpecsSystem Spec

  6. #6


    Posts : 16
    windows 8


    I tried that nothing happened. I bought my pc from best and was surprised how little bloatware was on it. I did my best to remove the junk right away
      My System SpecsSystem Spec

  7. #7



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Dumb question I know, but I just have to ask: Have you run a manual scan? In Defender there is no auto scan switch, just an admin turn this app on and turn on real time protection. Once your system has been thoroughly scanned the real time is enough(theoretically). It could also be scanning should be done daily when Maintenance is done. In Action Center under Maintenance>Automatic maintenance>change maintenance settings, have you set a time when your PC is ON but NOT in use, to do daily maintenance. The time is important.
      My System SpecsSystem Spec

  8. #8


    Posts : 16
    windows 8


    My pc is on 24/7. I went under maintenance like you suggested and everything is correct. i check windows defender settings and real time protection is on. I also try to run a manual scan once a week but I would like my PC to do it for me like xp use to. instead the action center says it needs to do a scan at least once a week but won't do it automatically.
      My System SpecsSystem Spec

  9. #9



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Your not the first on with this problem read this on Microsoft Community.
    This is the last post there:

    GreginMich replied on February 10, 2014



    In reply to Mission444's post on February 10, 2014



    The “normal” problem with this is that everything is hidden away so well that people just don't realize that a scheduled scan is being run. This is the first case I’ve seen where it’s actually failing to run. Since my reply was a highfalutin explanation of why you won’t have this problem with the Windows (8) Defender Scheduled Scan, and it turns out that you actually do have this problem, my reply should definitely be unmarked as the “answer” – and I’m not sure that I really have an answer for this one.


    The first thing you should do is run Automatic Maintenance manually (where it won’t be constrained to idle-time) and see if the scan completes successfully:
    Action Center > Maintenance > Start Maintenance

    And then run the System Maintenance Troubleshooter:
    Action Center > Troubleshooting > System and Security > Run maintenance tasks > Advanced

    And while you’re in the vicinity, run the Power Troubleshooter:
    Action Center > Troubleshooting > System and Security > Improve power usage > Advanced

    If that doesn’t help, then I would take a look at the Event Viewer and Task Scheduler logs for a clue to what’s going on:
    Event Viewer > Applications and Services Logs > Microsoft > Windows > Windows Defender > Operational
    Task Scheduler > Task Scheduler Library > Microsoft > Windows > Windows Defender > Windows Defender Scheduled Scan (History)
    Task Scheduler > Task Scheduler Library > Microsoft > Windows > Task Scheduler > Regular Maintenance (History)


    GreginMich

      My System SpecsSystem Spec

  10. #10


    Posts : 16
    windows 8


    Ok. Thanks for the help. I will check all that. Pc won't let me access event viewer and task scheduler. It gives me an error message task validation incorrect. More digging into that
      My System SpecsSystem Spec

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windows defender not scanning on its own
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