defender won't turn on - problem with update?

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  1. Posts : 32
    windows 10
       #1

    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.
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  2. Posts : 149
    Windows 10 Pro x64
       #2

    Run the dism and sfc commands as instructed on the Windows 8.1/7 help pages then report back
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  3. Posts : 32
    windows 10
    Thread Starter
       #3

    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.

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  4. Posts : 149
    Windows 10 Pro x64
       #4

    OK - what about the SFC command?
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  5. Posts : 32
    windows 10
    Thread Starter
       #5

    garydexter said:
    OK - what about the SFC command?
    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>
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  6. Borg 386's Avatar
    Posts : 28,734
    Win 7 32, Win 7 64 Pro, Win 8.1 64 Pro, Win 10 64 Education Edition
       #6

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

    If SFC could not fix something, then run the command again to see if it may be able to the next time. Sometimes it may take running the sfc /scannow command 3 times restarting the PC after each time to completely fix everything that it's able to.

    If not, then run the Dism /Online /Cleanup-Image /RestoreHealth command to repair any component store corruption, restart the PC afterwards, and try the sfc /scannow command again.
    SFC Command - Run in Windows 10 - Windows 10 Forums

    Other options you could try:

    If you're having problems with Windows 10 on your PC, you could use push-button reset to refresh or reset Windows.

    Refresh your PC Fixes software problems by reinstalling the OS while preserving the user data, user accounts, and important settings. All other preinstalled customizations are restored to their factory state. In Windows 10, this feature no longer preserves user-acquired Windows apps.
    Repair Install Windows 10 with an In-place Upgrade - Windows 10 Forums
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  7. Posts : 32
    windows 10
    Thread Starter
       #7

    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?
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  8. Borg 386's Avatar
    Posts : 28,734
    Win 7 32, Win 7 64 Pro, Win 8.1 64 Pro, Win 10 64 Education Edition
       #8

    jimbabwe said:
    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?
    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.
    Last edited by Borg 386; 19 Oct 2015 at 08:40.
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  9. elbmek's Avatar
    Posts : 1,900
    Win 10 x 64 Home. Pro x 64 on Surface.
       #9

    My defender is off because AVG has switched it off.
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  10. Brink's Avatar
    Posts : 56,346
    64-bit Windows 10 Pro for Workstations build 21359
       #10

    jimbabwe said:
    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?
    Hello Jim, :)

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

    Refresh Windows 10
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