When I browse through forums I often find this question asked many times – I am unable to lớn turn on Windows Defender manually or Windows Defender won’t or will not turn on & start in Windows 11, Windows 10, Windows 8, or Windows 7. If you face this issue, then this post may help you.

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On Windows 10, open Windows Security > Virus protection & toggle the Real-Time Protection switch khổng lồ On position.2> Chechồng the date or time on your PCThe other issue that could cause Windows Defender not to lớn work properly is the incorrect date or time on your Windows machine. Make sure you have sầu phối your Windows clock & date set properly and then try khổng lồ turn your Windows Defender baông xã on và see if it works fine. It’s strange, but most of the Windows operating system functions work, based on the system date và time. So an incorrect date or time could trigger abnormal behavior in your Windows OS.
3> Run Windows UpdateAnother important thing that could cause issues is, if you Windows is not up to lớn date, in terms of Windows Update. This could cause issues in Windows Defender or any other Windows core application. When it comes to lớn any security software, it always needs the lakiểm tra signature updates & other Windows core updates to keep your PC secure. So I would highly recommend running a complete Windows Update, then go inkhổng lồ Windows Defender and run an update from there as well. Then see if your Windows Defender is working fine.4> Cheông xã Internet Zone settingsThe above-discussed scenarios are the most comtháng ones. Apart from these, there could be some minor issues that could affect the working of Windows Defender. It could be an incorrect Zone setting in Internet Explorer, which you can fix by resetting Internet Explorer to factory settings. Again, if you are using a Proxy VPS, Windows Defender will not be able khổng lồ update.In such cases, you need to lớn make some small changes to lớn your Proxy server.Press Windows + X & select Comm& Prompt (Admin)Type in the following & hit Enter:NETSH WINHTTP. SET PROXY 1.1.1.1:8080 or NETSH WINHTTP SET PROXY MYPROXY.NET:8080Now reboot the system và see if it works.5> Chechồng Group Policy settingmở cửa Group Policy Editor and navigate to the following setting:Computer Configuration > Administrative sầu Template > Windows Components > Windows Defender Antivirut.SIn the right pane, double-click on Turn off Windows Defender Antivirus.Next, select Not Configured, cliông chồng the Apply & OK button.6> Cheông xã Registry settingmở cửa Registry Editor and navigate lớn the following setting:HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderLocate DisableAntiSpyware key. If this key is not present, create a new và DWORD (32-bit) Value.Set its Value data to 0 & exit.7> Chechồng the status of ServiceRun services.msc to lớn open Services Manager. Ensure that the Windows Defender service is started và set lớn Automatic.8> Scan PC with portable antivi khuẩn softwareFinally, it could be a malware itself that’s causing Windows Defender not to lớn work properly. You could download và use Windows Defender Offline Tool or any other standalone antivi khuẩn software và run a complete scan.9> Check value of AllowUserUIAccessIf under Windows Security settings, the option for “Virus và threat protection” has disappeared, then Andrew suggests the following:Run Registry Editor as Administrator & go to:ComputerHKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderPolicy ManagerSet value of AllowUserUIAccess to lớn 1.These are some comtháng reasons why Windows Defender does not start.

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PS: Windows Defender is turned off or not working offers some additional troubleshooting suggestions, which may also interest you.You may also want to lớn check out these posts which help troubleshoot Windows Defender problems:Error 0x800106a, Windows Defender will not turn onWindows Defender Error Code 0x800106ba: Application failed lớn initializeWindows Defender Error: MSASCui.exe pháo – Unable To Locate ComponentError 0x80070422 The Service Couldn’t Be Started in Windows DefenderError 0x805080đôi mươi, 0x800705b4 for Windows Defender.

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Microsoft Defender SmartScreen prevented an unrecognized ứng dụng from starting

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Error 8024402f, Protection definition update failed on Windows 11

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Better manage Microsoft Defender with DefenderUI for Windows 11/10


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Shyam aka “Captain Jack” is a Microsoft MVP.. alumnus and a Windows Enthusiast with an interest in Advanced Windows troubleshooting. Suggestions made & opinions expressed by hyên here are his personal one"s và not of his current employers. He blogs at captaindbg.com.
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