Windows 10: How to disable Windows Defender 'Health Scan'?

  1.    02 Mar 2018 #1

    How to disable Windows Defender 'Health Scan'?


    This relates to Windows Defender Security Center running under Windows 10, Version 10.0.16299.



    Consistently (not sure if it's the same time every day) I come back to my 'running' computer to find that it has restarted. That means that I have lost what was on the screen when I left. I have equated this inconvenience (to say the least) to a "Health Scan" initiated by the Windows Defender Security Center, which shows that it has freshly run for that date.



    Under Task Scheduler I regularly disable: "Windows Defender Scheduled Scan, " but it evidently turns itself back on automatically, perhaps at the behest of some Defender or other update.



    Is there a way to keep this from happening? Perhaps the utility senses that the computer is inactive, jumps in and does its thing while no one is watching. But restarting Windows, requiring a login, should be beyond the call of this feature. What can be done, save installing a different antivirus program, and turning Windows Defender off?
      My ComputerSystem Spec

  2.    03 Mar 2018 #2

    Hi, what does this show?
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    I quite appreciate no-one wants an unexpected restart. Oddly, I had one recently, related to some check run on my disk- the first such restart ever with Win 10 I think. However, that restarted to a login prompt as expected.

    It would be wise to discover the underlying issue.

    You might want to try running
    chkdsk C: /scan
    from an admin command prompt.

    I have Avast installed- that does not mean health scans are not done.
    Other than that - but only as a temporary measure- you might try editing the Action - add a character to the exe file name, say, to make it invalid.
      My ComputerSystem Spec

  3.    03 Mar 2018 #3

    Thanks for the reply, dalchina. Here's what my screen shows:

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    ...same as yours, except no battery. Funny, perhaps the restart is NOT the fault of a Health Scan. They seemed to be coincidental, all the times that I've looked, but as there is no report as to the time the scan was done, can't tell for sure. What makes me wonder is that I only turned my system on moments ago, saw your reply, checked my own Health screen, and note that supposedly it did a scan already today! In the first couple of minutes! If this is something Windows does on boot or wakeup, then it might not be what's restarting Windows.
      My ComputerSystem Spec

  4.    03 Mar 2018 #4

    Normally the first thing to suspect with random restarts would be hardware.

    Suggest you do a RAM check (see Tutorial section for a guide if unsure).
    You have 16Gb- are all sticks identical?

    Check your disk(s) e.g. Hard disk sentinel (trial) - if ok
    Do the chkdsk scan as above
    If ok from an admin command prompt run
    SFC /SCANNOW
    and post the summary result.

    Check your Reliability History and explore red x's.

    Try changing the setting as in Step 1 Disabling the automatic restart option to view error messages here:
    HP PCs - The Computer Restarts Unexpectedly (Windows 10, 8) | HP® Customer Support
      My ComputerSystem Spec

  5.    03 Mar 2018 #5

    Okay, Dalchina,

    Here's the results of that scan:

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    And under Reliability History, I do see unexpected shutdowns every couple of days:

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    And under Technical Details, this is typical:

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    Does this suggest anything? Not sure what 'Blue Screen' means there. Same "Code: 10000ea" for each shutdown.
      My ComputerSystem Spec

  6.    03 Mar 2018 #6

    Further, I see this under Event Viewer:

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    Those are the four instances of restart.
      My ComputerSystem Spec

  7.    04 Mar 2018 #7

    Ok, so really this is a BSOD case, and needs to be handled by our BSOD experts. Suggest you post a thread in that section to get the best attention. When you post there you will see instructions how to post in that thread and how to collect logs for your post.

    However, the greatest probability is this is a failing PSU. (See last link).

    Please also see the last item in my previous post - that's so you get notification on restart, rather than a 'silent' restart.

    Please see:
    https://support.microsoft.com/en-gb/...-without-clean

    How to fix Windows 10 error Event ID 41 ‘Kernel-Power’ - Windows 10
      My ComputerSystem Spec


 

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