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i accidentally deleted windows security how do i reinstall it?

microsoft user 231476 21 Reputation points
May 18, 2021, 7:12 PM

so my computer is messed up so SOMEHOW the windows security whole app got deleted litearlly i still see it as a app but when i open it nothing opens and i tried other things like running it from the run app and stuff like that it also sometimes says you will need a new app to open this windws defender link. if anbody could pls help me with this problem with my computer like i cant open the microsoft store but thats for another forum

Windows 10 Security
Windows 10 Security
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
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  1. May 19, 2021, 7:08 AM

    Hello there,

    You can try actions as follows:
    Plan A

    1. Enter “powershell” in windows search bar,right click it and “run as administer”;
    2. Enter these commands
      DISM.exe /Online /Cleanup-image /Scanhealth
      DISM.exe /Online /Cleanup-image /Checkhealth
      DISM.exe /Online /Cleanup-image /Restorehealth
      97777-1.png

    Plan B

    1. Open Settings> Windows Update> Check for updates;
      97763-2.png
    2. Run Windows update to update your system,
      See if there is a patch for Windows Defender to update,
      Updating your system may solve this problem.

    Plan C

    1. If you have installed a third-party security software, your windows defender will enter disabled mode by default.
    2. In that case, uninstall the third-party security software.

    Referring to your Microsoft Store issue

    1. If the Store app doesn't open, hangs, or not working correctly, then re-registering the Store will usually fix this issue.
    2. Terminate the Microsoft Store app to make sure it's closed and not running.
    3. Enter “powershell” in windows search bar,right click it and “run as administer”;
    4. Enter this command

    Get-AppXPackage WindowsStore -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}

    97667-3.png
    5. When finished, close the elevated PowerShell,
    Restart the computer to apply.
    Try opening the Microsoft Store app again.

    OR the problem may caused by current user’s profile broken, in that case you may try to create another account to see if it is ok.

    Best Regards,
    Samson Peng


  2. Reza-Ameri 17,006 Reputation points
    May 19, 2021, 3:10 PM

  3. Chandana S Kallesh 21 Reputation points
    Jun 30, 2022, 10:20 AM

    @microsoft user 231476

    Kindly Perform Below steps and let us know if you still getting the error

    To stop and then restart these services by using a batch file, follow these steps:

    Click Start, type Notepad in the Search box and then click Notepad in the programs list.

    Select the following text, right click the selected text, and then click Copy. Right-click anywhere in the Notepad window, and then click Paste.

    sc config MpsSvc start= auto
    sc config KeyIso start= auto
    sc config BFE start= auto
    sc config FwcAgent start= auto
    net stop MpsSvc
    net start MpsSvc
    net stop KeyIso
    net start KeyIso
    net start Wlansvc
    net start dot3svc
    net start EapHostnet
    net stop BFE
    net start BFE
    net start PolicyAgent
    net start MpsSvc
    net start IKEEXT
    net start DcaSvcnet
    net stop FwcAgent
    net start FwcAgent
    In Notepad, Click File, click Save As, and then type Repair.bat in the File name box

    Click the Save as type box, and then click All Files (.).

    In the left pane, click Desktop, and then click Save.
    In the left pane, click Desktop, and then click Save.

    On the File menu, click Exit.

    On your desktop, right-click the Repair.bat file that you saved in step 5, and then click Run as administrator.

    Important If you are prompted for confirmation to stop a service, press Y on the keyboard, and then press Enter

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