Windows Defender Errors Solved

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  1.    22 Apr 2018 #1

    Windows Defender Errors

    Hi all. Some strange behavior from Windows 10 Defender and it seems to point to the April Cumulative Update KB4093112 but I'm not positive. It's fine if the moderators want to move this thread.

    Prior to the CU, Defender worked perfectly. A very short time after a successful install, the following started happening...

    1. Defender updates automatically or manually and has no problem running a manual scan.
    2. Defender no longer runs auto scans -- 0x2 error. The other three processes in Task Scheduler show "operation completed successfully".
    3. If I restart the computer and leave it idle, Defender will then immediately run a successful automatic scan and reflect that in the Task Scheduler.
    4. The very next day in Task Scheduler, what showed as successful the previous day suddely shows all four Defender processes as "terminating unexpectedly" with error 0x8007042b. A few hours later, still on the previous day's date, the three processes change to "completed successfully" and the auto scan process is back to the 0x2 error.

    AV scans, Malwarebytes, sfc /scannow and all DISM commands come up perfectly normal. My neighbor set up a brand new laptop the day before the cumulative update and Defender worked as it should. She got the CU a day later and now has the exact same Defender issues.

    Any ideas or suggestions? I'm content to see if this sorts out with the big update we're waiting for. If it doesn't, then I might just resort to manual scans or consider a third-party AV.

    Thanks for reading!
      My ComputerSystem Spec

  2. Caledon Ken's Avatar
    Posts : 12,303
    Windows 10 Pro x64 Build 1809
       23 Apr 2018 #2

    Hi Crizal

    I think I would uninstall KB4093112 and instead install the one they released today

    Cumulative Update KB4093105 Windows 10 v1709 Build 16299.402 - Apr. 23
      My ComputerSystem Spec

  3.    24 Apr 2018 #3

    @Caledon Ken -- seems to help. Thanks for suggestion.
      My ComputerSystem Spec

  4.    24 Apr 2018 #4

    @Caledon Ken -- thanks for the suggestion. I already had the new CU installed so I uninstalled both and just reinstalled the one that came out yesterday. Helps a bit. Perhaps the new feature update will sort it out even more.
    Last edited by Crizal; 24 Apr 2018 at 05:47.
      My ComputerSystem Spec

  5. Caledon Ken's Avatar
    Posts : 12,303
    Windows 10 Pro x64 Build 1809
       24 Apr 2018 #5

    So you are still getting Defender errors and they are the same errors?

    Could you share a error code number?

      My ComputerSystem Spec

  6.    24 Apr 2018 #6

    @Caledon Ken -- only issue left is the 0x2 error for automatic scans. Once that shows up in Task Scheduler, if I restart the computer, the auto scan runs successfully. The other errors where the other three processes kept changing from successful to terminated unexpectedly to successful -- 0x8007042b -- are gone.
      My ComputerSystem Spec

  7. Caledon Ken's Avatar
    Posts : 12,303
    Windows 10 Pro x64 Build 1809
       24 Apr 2018 #7

    So I found these. Seems to be an old issue.

    Windows Defender Default Scheduled Task - Looking For Information

    Did you schedule this scan that fails? (You specifically added a scan, which by the way you should be able to do.)

    0x2 appears to be a file not found. Can you open event viewer, find error and post a screen shot of details.

    How to Upload and Post Screenshots and Files at Ten Forums

    The simplest fix may just be an in place repair.
      My ComputerSystem Spec

  8.    24 Apr 2018 #8

    Hi Ken -- I'm familiar with the thread showing how to change credentials and I did that last week. What I think I may do is run manual scans until the new feature update comes out and see if that creates a 'clean slate'. I did not schedule any scans, this is the automatic one Defender is supposed to do by itself. I can always go in and schedule my own scan which many posters say does work. The strange thing is how the scan fails and then runs properly after restarting apparently finding the file it couldn't with the 0x2 error.

    There are rumors on the internet that the new feature update 'might' come out today so I'm going to give this a rest for now and resume after the install (when ever that'll be). I'll be back to let you know what happens. Many thanks for your willingness to share your knowledge. It is most appreciated.

      My ComputerSystem Spec

  9. Caledon Ken's Avatar
    Posts : 12,303
    Windows 10 Pro x64 Build 1809
       24 Apr 2018 #9

    The in place repair / upgrade could produce the same results.

    Waiting is a good idea.

    Not sure about jumping into 1803 even if it comes out today. I use Macrium so I can just restore, with confidence.

    I will try 1803 on my goofing around machines but will wait on my daily drive. Let the dust settle a little.
      My ComputerSystem Spec

  10.    24 Apr 2018 #10

    Ken -- problem solved! Windows Defender has started to run its own automatic scans -- no errors and no need to restart the computer to kick-start as I mentioned in point 3 at the top of this thread. The only change was yesterday's cumulative update KB4093105. I didn't see anything related to Defender in the list of fixes, but it may have straightened out some things from the previous cumulative update on April 10th. Fingers crossed this keeps up. Thanks again for everything!
      My ComputerSystem Spec

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