Defender not Running Regular Scan

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  1. bru
    Posts : 342
    Windows 10 Home
       #21

    My scheduled Quick Scan did not run today. Last run result shows 0x2. The Windows Defender program does not show the scan ran under Scan Details as simrick reported. I am certain the task is scheduled correct.

    The scheduled Quick Scan ran reliably before the AU but does not run now. Not sure what else to do other than hope MS fixes whatever the AU broke.
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  2. Kol12's Avatar
    Posts : 2,788
    Windows 10 Pro ver 20H2
       #22

    Could you use a 3rd party AV instead? That's what I think I might do.
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  3. Kol12's Avatar
    Posts : 2,788
    Windows 10 Pro ver 20H2
       #23

    You've got Defender doing manual scheduled definition updates now right? Why do you want to schedule scans? It looks as though it does an auto quick scan once daily.
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  4. bru
    Posts : 342
    Windows 10 Home
       #24

    Having up to date definitions is important, but a periodic scan will ensure the system is clean. MS agrees and included a Quick Scan as part of Automatic Maintenance. Problem is, in order for the Quick Scan that is part of Automatic Maintenance to run consistently, several things have to occur: The computer needs to be idle long enough for the scan to start. If the computer is set to sleep after 10-20 minutes that won't allow enough idle time for the scan to initiate. Assuming the computer is idle long enough for the scan to start, any activity on the computer will terminate the scan. And I mean anything. Even just moving the mouse will terminate the scan.

    I was able to get the Auto Maintenance QS to run by delaying sleep for 30 minutes and making sure I didn't touch the computer. But those are some serious limitations for how I (and I suspect many) use my computer. So I set a scheduled task to run the Quick Scan. By setting specific conditions the scan will run to completion without terminating at a moments notice like the Auto Maintenance scan. I then disabled the Auto Maintenance Quick Scan since it would still try to run even though my scheduled scan had already occurred. The scheduled scan worked fine, until the AU. The AU somehow broke scheduled tasks related to Defender. It broke my scheduled task for definition updates, but I was able to resolve that as I previously posted. I have not been able to resolve the scheduled scan not running. At least not yet.
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  5. Kol12's Avatar
    Posts : 2,788
    Windows 10 Pro ver 20H2
       #25

    Fair enough, but couldn't you do this with a 3rd party AV? Apparently WD doesn't rank very high: Best Free PC Antivirus Software 2016 - Tom's Guide
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  6. bru
    Posts : 342
    Windows 10 Home
       #26

    Yes of course I could use a third party AV. Third party AVs tend to hog resources. The free versions have nag screens that appear often and some leave behind lots of remnants when removed. I have used MSE and WD for many years without issue. I do realize they don't rank as high as others but I do use MBAM as an adjunct and rarely have had problems.

    WD meets my needs and I'd like to still use it, but as I want by scheduling it to run on my terms. Apparently MS doesn't want that to occur.
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  7. bru
    Posts : 342
    Windows 10 Home
       #27

    This issue (scheduled Defender Quick Scan) continues to perplex.

    I am on my computer exactly when the scheduled scan should start. I see no evidence of it running via the icon in the notification area (no spinning blue wheel). However, when I opened Defender lo and behold a scan is running. Once Defender was opened the blue wheel appears on the icon in the notification area. The scan completed and shows in "Scan details: Last scan". In Task Scheduler the status shows "The operation completed successfully (0x0)". So that begs the question, is a scan really running if there is no evidence of it running? If I had not opened the program would the scan show as completed? Based on previous days I would say no, or maybe. Previously Task Scheduler always showed "(0x2)". This may go along with what simrick was saying about the 0x2 code. Whatever is happening it seems different than how it behaved before the AU.
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  8. simrick's Avatar
    Posts : 16,108
    W10Prox64
       #28

    bru said:
    This issue (scheduled Defender Quick Scan) continues to perplex.

    I am on my computer exactly when the scheduled scan should start. I see no evidence of it running via the icon in the notification area (no spinning blue wheel). However, when I opened Defender lo and behold a scan is running. Once Defender was opened the blue wheel appears on the icon in the notification area. The scan completed and shows in "Scan details: Last scan". In Task Scheduler the status shows "The operation completed successfully (0x0)". So that begs the question, is a scan really running if there is no evidence of it running? If I had not opened the program would the scan show as completed? Based on previous days I would say no, or maybe. Previously Task Scheduler always showed "(0x2)". This may go along with what simrick was saying about the 0x2 code. Whatever is happening it seems different than how it behaved before the AU.
    Interesting. And today, for the first time, my Defender shows as running at 2:53pm, instead of the normal (around) noon time. I know the computer was on and not sleeping, as I was using it all that time.
      My Computer


  9. bru
    Posts : 342
    Windows 10 Home
       #29

    simrick said:
    Interesting. And today, for the first time, my Defender shows as running at 2:53pm, instead of the normal (around) noon time. I know the computer was on and not sleeping, as I was using it all that time.
    I was going to respond to your earlier post that I think what you are (were) seeing is the Automatic Maintenance Quick Scan. Especially if the time is so far off from when your scheduled scan is set. What does your Task Scheduler show for the scheduled task? I am guessing it will show (0x2).

    I have the Automatic Maintenance Quick Scan disabled so I know that what is being reported (or not reported) is for my scheduled Quick Scan.
      My Computer

  10. simrick's Avatar
    Posts : 16,108
    W10Prox64
       #30

    bru said:
    I was going to respond to your earlier post that I think what you are (were) seeing is the Automatic Maintenance Quick Scan. Especially if the time is so far off from when your scheduled scan is set. What does your Task Scheduler show for the scheduled task? I am guessing it will show (0x2).

    I have the Automatic Maintenance Quick Scan disabled so I know that what is being reported (or not reported) is for my scheduled Quick Scan.
    Is this what I want to look at?

    Defender not Running Regular Scan-defender-scan09.png

    Defender not Running Regular Scan-defender-scan10.png

    Funny enough it shows 0x0 today. I wonder if the update that came through last night had anything to do with that?
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