Windows 10: Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424)

Discus and support Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424) in Windows 10 Installation and Upgrade to solve the problem; Hello, I'm on windows 10 family version 1803. Last time my computer checked for update: 14.09.2018 I recently realised that no system update have... Discussion in 'Windows 10 Installation and Upgrade' started by FSSog, Jul 12, 2019.

  1. FSSog Win User

    Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424)


    Hello,


    I'm on windows 10 family version 1803. Last time my computer checked for update: 14.09.2018


    I recently realised that no system update have been done for 10 months and that F-Secure was not on my computer anymore (just a shortcut on my desktop leading nowhere). When I try to update I have an error with the number "0x80070424".


    When I go in Windows Defender, it tells me that it is deactivated and that my system administrator is in charge (and I can't activate Defender antivirus, it's greyed). Everything in Defender is kinda "freezed", I can't do lots of things. Firewall seems to be on even if it's telling me that it's parameters are susceptible to compromise the security of my machine. Anything I try to restore/reinitialize on Defender does nothing.


    I already tried some manipulations to get back Windows Update (the ones that doesn't need a second computer here: https://support.microsoft.com/fr-ch/help/976275) but nothing do the job.


    I don't know what kind of info are needed to get this thing done. I don't even know if both problems are linked... Please help Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424) :)


    Any ideas?


    Thanks in advance <3

    :)
     
    FSSog, Jul 12, 2019
    #1
  2. P4-630 Win User

    Task to auto update windows defender definitions disappears

    My mom has a new laptop with windows 8.1, we always set the windows updates to manual.
    On our other windows 8.1 computers I have created a task for auto updating windows defender definitions, which works fine for us.

    This is how I created this task:

    "Click on "Create Task", name it what you like (mine is Daily Signature Update), set the trigger as the time you want it to run every day.

    For Action browse to Program Files\Windows Defender\MpCmdRun.exe and select it. In "Add arguments" add -SignatureUpdate -MMPC"

    But somehow this task disappears once it has run on my mom's laptop.
    I'm logged in as admin and then I also tried it with running the task scheduler as admin, the task just disappears every day for some reason, while it works fine on our other windows 8.1 computers.

    Anyone an idea why this task disappears every time?

    Thanks.
     
    P4-630, Jul 12, 2019
    #2
  3. Jsssssssss, Jul 12, 2019
    #3
  4. Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424)

    Is Windows Defender a proper Antivirus for Windows 10 ?

    1) Yes.

    2) Yes.

    3) Many. Suggestion to use your preferred search engine and look it up. Also see:

    https://support.microsoft.com/en-us/help/18900/consumer-antivirus-software-providers-for-windows


    Suggestion to read:

    ===

    4) Are you spamming?
     
    Jsssssssss, Jul 12, 2019
    #4
Thema:

Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424)

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