Windows 10: defender won't turn on - problem with update?

Discus and support defender won't turn on - problem with update? in AntiVirus, Firewalls and System Security to solve the problem; Okay - tried to turn on defender got error code 0x800b0100 Googled that and the Windows update troubleshooter says I have a missing or corrupt file... Discussion in 'AntiVirus, Firewalls and System Security' started by jimbabwe, Oct 7, 2015.

  1. JIMBABWE
    jimbabwe Win User

    defender won't turn on - problem with update?


    Okay - tried to turn on defender got error code 0x800b0100
    Googled that and the Windows update troubleshooter says I have a missing or corrupt file but the only help page I could find was for 8.1, not Windows 10 (which I'm running) so I'm not sure where to go from here. So I'm asking you guys for help.

    Not sure what info you would need to help me out but please help me out.

    :)
     
    jimbabwe, Oct 7, 2015
    #1
  2. PA BEAR - MS MVP
    PA Bear - MS MVP Win User
    PA Bear - MS MVP, Oct 7, 2015
    #2
  3. JOSEPHZHAO
    JosephZhao Win User
    Windows Defender won't turn on when I try to turn it on. It says operation failed because it timed out.

    * Original Title: Windows Defender

    Windows Defender won't turn on when I try to turn it on. It says operation failed because it timed out. Is there a way to turn it on?
     
    JosephZhao, Oct 7, 2015
    #3
  4. GARYDEXTER
    garydexter Win User

    defender won't turn on - problem with update?

    Run the dism and sfc commands as instructed on the Windows 8.1/7 help pages then report back
     
    garydexter, Oct 8, 2015
    #4
  5. JIMBABWE
    jimbabwe Win User
    okay ran the dism commands
    dism.exe /online /cleanup-image /scanhealth
    dism.exe /online /cleanup-image /restorehealth
    and got the following message:

    Error: 0x800f081f


    The source files could not be found.
    Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see Configure a Windows Repair Source.


    The DISM log file can be found at C:\WINDOWS\Logs\DISM\dism.log

    I tried looking up the error code and was redirected back to the same DISM page as before.
     
    jimbabwe, Oct 9, 2015
    #5
  6. GARYDEXTER
    garydexter Win User
    OK - what about the SFC command?
     
    garydexter, Oct 11, 2015
    #6
  7. JIMBABWE
    jimbabwe Win User
    C:\WINDOWS\system32>sfc /scannow


    Beginning system scan. This process will take some time.


    Beginning verification phase of system scan.
    Verification 100% complete.


    Windows Resource Protection found corrupt files but was unable to fix some
    of them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For
    example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not
    supported in offline servicing scenarios.


    C:\WINDOWS\system32>
     
    jimbabwe, Oct 11, 2015
    #7
  8. BORG 386
    Borg 386 Win User

    defender won't turn on - problem with update?

    Run it at least 3 times before ruling that option out as a fix.

     
    Borg 386, Oct 12, 2015
    #8
  9. JIMBABWE
    jimbabwe Win User
    Can you clarify - the refresh option mentions dumping apps and the like while keeping personal data - where do things like documents, pictures, movies, games and the like fit in? Will they be wiped or kept?
     
    jimbabwe, Oct 18, 2015
    #9
  10. BORG 386
    Borg 386 Win User
    I couldn't tell you because I haven't used it yet. The person to ask who might know would be the writer of the tutorial, Brink. I sent him a request because I'm also curious about the answer.
     
    Borg 386, Oct 18, 2015
    #10
  11. ELBMEK
    elbmek Win User
    My defender is off because AVG has switched it off.
     
    elbmek, Oct 18, 2015
    #11
  12. Brink
    Brink New Member
    Hello Jim, *Smile

    Personal files would be anything in your "C:\Users\(user-name)" profile folder.

    Refresh Windows 10
     
    Brink, Oct 18, 2015
    #12
  13. ANDYFH
    AndyFH Win User

    defender won't turn on - problem with update?

    When another antivirus program is installed Windows will turn Defender off.
     
    AndyFH, Apr 5, 2018
    #13
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defender won't turn on - problem with update?

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