1. Joined : Jul 2016
    Posts : 13
    windows10
       13 Jul 2016 #1

    Why does Action Center tell me "Windows Defender needs to scan?"


    It's my understanding that Defender scans according to Microsoft's maintenance schedule. But I get a notice in the Action Center that "Windows Defender needs to scan." My last scan occurred 4-5 days ago when I noticed the alert.

    Is it possible that since my computer is powered down at bed time that the scheduled scan is skipped (and not started next morning when I power it up?

    How often is Defender scheduled to scan?

    Thanks for your help!
    Al
      My System SpecsSystem Spec


  2. Joined : Feb 2015
    Bamberg Germany
    Posts : 12,894
    Microsoft Windows 10 Pro 64-bit 14393 Multiprocessor Free
       14 Jul 2016 #2

    If the computer is powered down at maintenance time, it will do it the next time you power up(and after a few minutes when the PC is idle).
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    Do you possibly have Windows Defender checked in Disk Cleanup?
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    Uncheck as it clears Defenders logs, and Windows will think you have not run a scan yet.

    Same thing goes if you have Ccleaner:
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      My System SpecsSystem Spec


  3. Joined : Jul 2016
    Posts : 13
    windows10
       14 Jul 2016 #3

    Thanks Cliff S for the very detailed reply. My Task Scheduler settings are as shown in your illustrations, so looks like Defender is scheduled to run at power up. I do run Disk Cleanup on occasion, and if it detects Defender files, I would not have omitted them from the clean up options (At this time, Defender does not show up in clean up). I also run CCleaner regularly, and I did have Defender ticked for clean up. So looks like that was the issue. Thanks again for your work on this site!
      My System SpecsSystem Spec


  4. Joined : Feb 2015
    Bamberg Germany
    Posts : 12,894
    Microsoft Windows 10 Pro 64-bit 14393 Multiprocessor Free
       14 Jul 2016 #4

    You're most welcome
      My System SpecsSystem Spec


  5. Joined : Jul 2015
    Posts : 733
    Windows 10 Home x64
       15 Jul 2016 #5

    I have never had any trouble cleaning WD data with the built-in disk cleanup util. CC on the other hand...
      My System SpecsSystem Spec


 


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