Windows 10: Some virus deleted Windows Defender

Discus and support Some virus deleted Windows Defender in AntiVirus, Firewalls and System Security to solve the problem; Some virus deleted Windows Defender and i cant update my PC it says 0x80070424. And i go to services and it deleted system or what it is Windows Update... Discussion in 'AntiVirus, Firewalls and System Security' started by Raul_090, May 10, 2021.

  1. Raul_090 Win User

    Some virus deleted Windows Defender


    Some virus deleted Windows Defender and i cant update my PC it says 0x80070424. And i go to services and it deleted system or what it is Windows Update

    :)
     
    Raul_090, May 10, 2021
    #1

  2. Window 10 or Defender do not automatically delete virus created junk folders + files??

    Hi Carol,

    Thank you for posting your query on Microsoft Community. I understand the inconvenience you are facing. I apologies for delay in response. I will certainly help you with this.

    I understand you need to delete virus created junk folder (Quarantined items).

    Quarantined items are those items that were prevented from running but were not removed from your PC. I suggest you to follow the below given steps and check if it works:

    • Press Windows key and type Windows Defender and hit enter.
    • Click on History tab in Windows Defender Window.
    • Click on the Quarantined items radio button and click on history.
    • Check and select all the items that appear as junk.
    • Click on Remove button to delete them permanently.
    • Check and verify if all the junk folders and files are remove.


    Hope this information helps. Post back with updated issue details for further help.

    Thank you.
     
    Parth P Patel, May 10, 2021
    #2
  3. Cannot turn on Windows Defender virus protection

    I had the same sort of symptoms. In the Windows Security Center, under Virus and threat protection, it said "Your virus & threat protection is managed by your organization."


    Some virus deleted Windows Defender wm5Jc.png


    I note you mentioned the Registry Keys under HKLM/SOFTWARE/Microsoft/Windows Defender. Nice spotting, but it seems like there is another key that is causing the problem for some users.

    Steps to a solution:

    1. Press the Windows key and type "regedit"
    2. On the regedit icon that appears, right-click and select Run as Administrator.
    3. Navigate to the folder located at HKLM\SOFTWARE\Policies\Microsoft\Windows Defender (You can paste this into the address box at the top of the window, or navigate manually using the side directory structure)
    4. In this folder, there are probably two keys. Right-click and Delete the DisableAntiSpyware key.
    5. Exit regedit, and return to the Windows Defender settings screen (refresh it if necessary). Windows Defender should have the scan options available and working.

    Solution adapted from here, with a much more detailed solution here.
     
    MechtEngineer, May 10, 2021
    #3
  4. Some virus deleted Windows Defender

    Windows Defender realtime scanning will not switch on - it detects another anti-virus product.

    Windows Defender realtime scanning will not switch on, and the message suggests there is another anti-virus product present but if there is it does show up in Window 10 UI.

    The long story is that I am troubleshooting a problem with application software. The manufacturer suggest removing Bitdefender because there product is incompatible. I thought I would give this a try, if only to element Bitdefender as a cause.

    Firstly, I upgraded from Bitdefender 2016 to 2017 to see if that made a difference. The application still failed so I decided to try removal.

    • I used the standard uninstall to remove Bitdefender 2017, rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection
    • I download the uninstall application for Bitdefender 2017, ran it then rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection
    • I checked the file system and all Bitdefender files have been deleted.
    • I check the registry and found a couple of references to Bitdefender Wallet, then deleted these.
    • I rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection
    • I reran the uninstall application for Bitdefender 2017 then rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection.
    I can find no traces of Bitdefender so I wonder why Windows Defender detects another anti-virus software. I've check other posts but couldn't find additional steps for uninstalling an anti-virus software. Any suggestions?

    Moved from Windows 10
     
    SystemOfTheWorld, May 10, 2021
    #4
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Some virus deleted Windows Defender

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