Microsoft defender windows 11 не работает

by Loredana Harsana

Loredana is a passionate writer with a keen interest in PC software and technology. She started off writing about mobile phones back when Samsung Galaxy S II was… read more

Updated on October 4, 2023

A significant part of every Windows version, Microsoft Defender, has become one of the most reliable programs to protect your device against malware.

Built into Windows 11 as well, this program offers in-depth threat resistance research and advanced security to provide protection on all Windows devices.

So when an issue occurs and it doesn’t work properly or Windows 11 cannot open Windows Security, users turn to the Internet in search of causes and solutions to fix the error and get back the protection they need for their devices.

That is why we are going to take a look at the most common causes and show you how to get things on the right track.

How do I fix the Windows 11 Defender not working issue?

Before trying out more complicated solutions when your Windows Defender is not working, try out some of these quick fixes:

• Restart your computer
• Restart Windows Defender

In this article

• How do I fix the Windows 11 Defender not working issue?
• 1. Change the date and time
• 2. Update Windows
• 3. Enable real-time protection
• 4. Run a SFC scan
• 5. Change the Proxy Server
• Why is my Windows Defender not working in Windows 11?
• Windows 11 cannot open Windows Security
• What does Windows Defender has to offer to Windows 11 users?

1. Change the date and time

1. Click on the Start icon from the taskbar.
2. Select the Settings option.
3. Go to Time & language option from the left pane.
4. Select the Date & time option from the right pane.
5. Click on the Change button and set the correct date and time for your zone.

2. Update Windows

1. Click on the Start icon from the taskbar.
2. Select Settings.
3. Click on Windows Update.
4. Click on Check for updates.

3. Enable real-time protection

1. Click on the Search icon from the taskbar.
2. Type Windows Security and select it from the options.
3. Head over to Virus & threat protection.
4. On the right pane, under Virus & threat protection settings, click on Manage settings.
5. Switch the toggle On from under Real-time protection.

4. Run a SFC scan

1. Click on Search from the taskbar.
2. Type command prompt, and click on Run as administrator.
3. Enter the following line: sfc/scannow
4. Wait for the process to finish as it will take some time and then restart your computer.

5. Change the Proxy Server

1. Click on the Search icon from the taskbar.
2. Type Command Prompt and select the Run as Administrator option.
3. Type in one of the following:
   • NETSH WINHTTP SET PROXY 1.1.1.1:8080
   • NETSH WINHTTP SET PROXY MYPROXY.NET:8080
4. Reboot the system and see if it solves the issue.

If you change your mind and want to give a try to a third-party tool, choose Bitdefender since it’s known for the high detection rates of the latest malware, along with unbeatable multi-layer ransomware protection.

This was our last solution for the Windows 11 Defender not working issue. Moreover, you can read more about the causes of this problem.

Why is my Windows Defender not working in Windows 11?

If you have third-party antivirus software installed on your computer, note that it might lead to certain Windows Defender errors.

Choose to use either Windows Defender or a third-party antivirus tool. Also, if you just got a new laptop, check if it came with a preinstalled antivirus trial version as this can stop Windows Defender to work properly.

Here is what Microsoft said regarding the compatibility with other antivirus products:

What happens when another non-Microsoft antivirus/antimalware solution is used? Can you run Microsoft Defender Antivirus alongside another antivirus product? The answers depend on several factors, such as your operating system and whether you’re using Microsoft Defender for Endpoint (Defender for Endpoint) together with your antivirus protection.

And if you work with programs like Flash or Java, you might need to uninstall the free security scanner which can cause some issues.

Although this might come as a surprise, another common reason why Windows Defender might not start is an incorrect time and date as most system functions are dependent on time and date.

Even more, an outdated PC can lead to many errors so we always recommend you perform a full update on your computer and on the antivirus as well.

If you’re having difficulties updating Windows Defender, you might need to install the virus definitions manually.

Windows 11 cannot open Windows Security

Several users described a similar situation: when they click on the Open Windows Security button from the Windows Security tab inside Settings, they see an unusual pop-up instead of actually opening the application.

It reads You’ll need a new app to open this windowsdefender link, giving them the option to search the Microsoft Store for an app.

Fortunately, though, there is an easy solution to solve the problem right away. You simply need to press the Windows key, type PowerShell, right-click it and select Run as administrator, then copy-paste this command and press Enter: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Fore more info on what to do if Windows Security is not opening on Windows 11, check out our dedicated guide.

What does Windows Defender has to offer to Windows 11 users?

Windows Defender is pretty much the same as it was on the previous OS but there is one remarkable feature called Microsoft Defender Application Guard (MDAG) that you should know more about.

It is available for several types of devices such as enterprise desktops and mobile laptops, as well as personally-owned laptops that are managed through Microsoft Intune or a similar tool.

Designed for Microsoft Edge and for Microsoft Office, the main purpose for Microsoft’s Application Guard is to prevent developing attacks and improve employee productivity:

Microsoft Defender Application Guard (Application Guard) is designed to help prevent old and newly emerging attacks to help keep employees productive. Using our unique hardware isolation approach, our goal is to destroy the playbook that attackers use by making current attack methods obsolete.

The way the system works is quite easy to understand. For example, for Microsoft Edge or Internet Explorer, MDAG will help isolate previously defined untrusted sites, therefore, protecting your company from any attack.

If someone opens a page from an untrusted website, Microsoft Edge will open the page in an isolated Hyper-V-enabled container.

You can choose which websites, cloud resources, or internal networks are to be trusted or not. Also worth mentioning is the fact that this feature doesn’t require Hyper-V to be turned on.

Now there you have it, the most likely situations that can create errors and the solutions to fix them on your Windows 11 device.

Moreover, if your Windows Defender is turned off on your Windows 11 PC, do not hesitate to edit your registry in order to enable it back on.

And if the Windows Defender service won’t start, make sure to clean your registry and check your environment variables.

What solution from the ones presented above worked for you to fix the Windows 11 Defender not working issue? Let us know in the comments section below.

В Windows 10 и Windows 11 есть встроенный (и довольно неплохой) антивирус Microsoft Defender Antivirus (Защитник Windows), управляемый через панель Безопасность Windows. В некоторых случаях Windows Defender или панель управления Безопасность в Windows перестают открываться, вместо диалогового интерфейса показывается пустое белое окно, приложение не запускается при вызове через панель Settings или командой быстрого доступа
ms-settings:windowsdefender
. В этой статье мы рассмотрим, как исправить типовые ошибки, когда не удается открыть окно службы безопасности Windows Defender.

В первую очередь проверьте, не уставлен ли в Windows сторонний антивирус. Windows Defender в панели безопасности Windows автоматически отключается при использовании не-Microsoft антивируса. Решите какой антивирус вы хотите использовать в дальнейшем, если нужно оставить защитник Windows, удалите сторонний антивирус.

Если при запуске Windows Security (Windows Defender) через меню Параметры (Settings -> Update & Security -> Windows Security), появляется окно с предложением выбрать программы для открытия ссылки “
You’ll need a new app to open this Windowsdefender link
”, проверьте что UWP приложение Microsoft.SecHealthU установлено. Именно UWP приложение Windows Security (Windows Defender) отвечает за отображение окна Безопасность Windows.

Если нужно сбросьте его настройки. Подробно это описывалось в статье Вам понадобится новое приложение, чтобы открыть эту ссылку WindowsDefender.

Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Убедились, что в Windows запущены все службы Microsoft Defender. В Windows должны быть запущены следующие службы:

• Microsoft Defender Antivirus Service (
  WinDefend
  )
• Windows Security Service (
  SecurityHealthService
  )
• Security Center (
  wscsvc
  )

Можно проверить список запущенных служб Защитника Windows через панель управления services.msc или с помощью PowerShell:

get-service WinDefend, SecurityHealthService, wscsvc | select name,status,starttype

Если службы отключены, измените тип запуска на Automatic и перезагрузите компьютер.

Службы Windows Defender Firewall (mpssvc), Microsoft Defender Antivirus Network Inspection Service (WdNisSvc) и Windows Defender Advanced Threat Protection Service (Sense) не являются обязательными для работы панели управления Security.

В панели управления безопасностью Windows может висеть надпись “Cлужба работы с угрозами остановлена, перезапустите ее”. Чтобы исправить такую ошибку Defender, следуйте этой инструкции.

В Windows 10 и 11 Microsoft Defender автоматически выключается, если на устройстве установлен сторонний антивирус. Если стороннего антивируса, нет, а Microsoft Defender отключен, значит кто-то очень сильно постарался, чтобы его отключить.

Начиная с Windows 10 2004 (в том числе в Windows 11) вы не можете просто отключить Microsoft Defender с помощью:

• ключей реестра DisableAntiVirus=1 и DisableAntiSpyware = 1 (HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender);
• или параметра GPO Turn off Microsoft Defender Antivirus в Computer Configuration -> Administrative Templates -> Windows Components -> Microsoft Defender Antivirus.

Для отключения Защитника Windows сначала придется отключить функцию защиты Microsoft Defender Tamper Protection в настройках Microsoft Defender.

Можно проверить, отключена ли защита антивируса Defender с помощью PowerShell:

Get-MpComputerStatus | select IsTamperProtected

В данном примере
IsTamperProtected=True
, это значит, что защита Windows блокирует отключение Microsoft Defender.

В более ранних версиях Windows 10, проверьте значение указанного выше параметра локальной групповой политики с помощью редактора gpedit.msc (параметр должен быть установлен в Не задано или Отключено) или с помощью PowerShell:

Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows Defender' -Name DisableAntiSpyware


Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows Defender' -Name DisableAntiVirus

Если команда вернет значение параметров =1, значит Microsot Defender отключен. Чтобы включить Защитник Windows, удалите параметр или измените значение на 0.

Проверьте и установите последние обновления Windows Settings -> Update & Security -> Windows Update -> Check for updates или с помощью PowerShell.

Если ничего не помогло, проверьте и исправьте целостность образа Windows командами:

sfc /scannow

и

DISM /Online /Cleanup-Image /RestoreHealth

Инструкции из этой статье должны восстановить работу службы Безопасность Windows.

Не запускается защитник Windows 11

Всем привет!!!

Если вдруг у вас на Windows 11 перестал открываться защитник, то решить проблему можно так.

Сбросить приложение Windows Defender открыть Power Shell от имени администратора и ввести команду:

Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

После этого защитник windows сразу можно запускать и пользоваться. Быстро и просто!!!

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Windows 11 Windows Defender not working is a common problem. If you cannot use it to protect your PC against viruses and malware attacks, some troubles may come to you. What should you do to fix Windows 11 Security not working to get real-time protection? Refer to this post and MiniTool will show you some possible methods.

Windows Defender Not Working Windows 11

Windows Security, usually known as Windows Defender, is an excellent antivirus program that comes with Windows 11 by default. As one of the best antivirus apps, it can run properly in most situations to protect your PC from threats like viruses, spyware, malware attacks, and more.

To use it, you won’t need to download Windows Security in Windows 11 but you are required to enable it in Settings. Just press Win + I to open Windows 11 Settings, go to Privacy & security > Windows Security > Open Windows Security. (Related article: How to Enable or Disable Microsoft Defender in Windows 11)

However, due to some reason, you may find Windows Defender is not working or starting/turning on in Windows 11 or Windows Defender Windows 11 missing. Sometimes you get a message saying “unexpected error”; sometimes you get a pop-up saying “you’ll need a new app to open this windowsdefender link”. Or sometimes you get other errors. No matter which situation you have, you cannot use Windows Defender for PC protection as normal.

Fixing Windows Security not working in Windows 11 is an urgent thing since viruses and malware may affect your computer. Fortunately, it is not a difficult task to solve this issue if you follow the methods below.

Fixes for Windows 11 Windows Defender Not Working

Set Date and Time Correctly

A common reason why Windows Defender won’t start/work is an incorrect time and date since most system features depend on time and date. So, make sure your date and time are set correctly.

Step 1: Click the Start icon from the Taskbar in Windows 11 and choose Settings to open this app.

Step 2: Move to the Time & language tab on the left side and click Date & time in the right pane.

Step 3: Click the Change button to set the correct time and date.

Restart Security Center Service

Windows Defender service not running may be another reason why Windows Security is not working or operating in Windows 11. To fix Windows 11 Windows Defender not working, make sure the service is running properly.

Step 1: To get the Run dialog, press Win + R.

Step 2: Type services.msc into the textbox and click OK to open Services.

Step 3: Go to find the Security Center service from the right pane, right-click it and choose Restart.

Besides, you should also check these services – Windows Defender Advanced Threat Protection, Windows Defender Firewall, Windows Defender Antivirus Network Inspection Service, and Windows Defender Antivirus Service and make sure they are running.

Step 4: Double-click each service to open the Properties window and set the Startup type to Automatic.

After that, go to check if Windows Defender can work. If it is still not working as normal, try other methods below.

Update Windows 11 to the Latest Version

Sometimes Windows Defender Windows 11 missing or Windows 11 Security not working appears due to the bugs in the certain Windows versions. To fix it, you can update it to the latest version to see if the issue is resolved.

Step 1: Click Start > Settings to get Windows 11 Settings interface.

Step 2: Go to Windows Update in the left sidebar and click Check for updates.

Step 3: If the system checks for some available updates, download and install them on your Windows 11 PC. Then, you may be able to run Windows Defender for PC protection against viruses and threats.

Disable or Uninstall Third-Party Security Software

If you also install a third-party antivirus program, it may interface with Windows Defender. If you want to run this app to keep your PC safe without having any conflicts, you had better disable or uninstall the third-party antivirus software from your Windows 11 PC.

After uninstalling the antivirus, reboot your PC and try to run Windows Defender to see if it can work properly.

Run an SFC Scan

Performing an SFC scan is a fast and straightforward solution to fix the issue of Windows Security not working Windows 11. System File Checker (SFC) can be used to check and fix system file corruption. This means if Windows Defender stops working due to faulty files, the scan can fix this issue.

Step 1: Type cmd to the search box and right-click on Command Prompt to choose Run as administrator.

Step 2: In the CMD window, type in sfc /scannow and press Enter to execute this scanning task.

After the verification is 100% complete, restart your PC and see if Windows Defender can work well.

Perform a Clean Boot

The running third-party services and programs may interrupt Windows, leading to Windows 11 Windows Defender not working. To get rid of the trouble, you can try to perform a clean boot.

Step 1: Open the Run window by pressing Win + R, type msconfig, and click OK.

Step 2: Under the Services tab, tick the checkbox of Hide all Microsoft Services.

Step 3: After that, click Disable all to disable all the services except Microsoft services.

Step 4: Go to the Startup tab and click Open Task Manager.

Step 5: Choose programs individually and click Disable to disable them to fix Windows Security not working in Windows 11.

Make Changes in Your Registry

If Windows Defender won’t start or work after trying many solutions, you can try to change Registry settings. Before you do, you had better back up your registry keys in Windows 11 to avoid system corruption due to mistaken operations.

Step 1: Type regedit to the search box and click Registry Editor.

Step 2: Go to this path: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.

Step 3: Locate DisableAntiSpyware in the right pane. If it is not here, right-click Windows Defender and choose New > DWORD (32-bit) Value to create it.

Step 4: Double-click this key and set its value data to 0.

Repair or Reset Windows Security Windows 11

If Windows Security is not working in Windows 11, another solution you can try is to repair or reset this app by following the steps below.

Step 1: Launch the Windows Settings app by pressing Win + I.

Step 2: Click App > App & features.

Step 3: Scroll down to find Windows Security, click the three-dot menu and choose Advanced options.

Step 4: In the new window, go to the Reset section, click Repair to repair it. If this cannot work, click Reset to reset this app.

Reset This PC

If all of these methods cannot fix Windows 11 Windows Defender not working, the last solution you can try is to reset your PC to its factory settings. To do this task, go to Settings > System > Recovery > Recovery options > Reset this PC. Then, choose an option based on your need and finish the resetting operation by following the instructions on the screen.

To know more information about PC resetting or reinstallation, refer to this post – How to Reinstall Windows 11? Try 3 Simple Ways Here Now!

“Is Windows Defender not working in Windows 11 or Windows 11 Security not working? Try these solutions to fix it. Or, you can share them with your friends on Twitter.”Click to Tweet

Suggestion: Back up Your PC

After trying the methods above, you should run Windows Security properly to protect your PC from malicious programs, viruses, and some other threats. In practice, only running antivirus is not enough to keep your PC safe. From this post – Is Windows Defender Enough? More Solutions to Protect PC, you know the reasons.

To prevent your PC’s data loss due to malware and virus attacks, you can choose to make a full backup for them. Besides, you had better create a system image to avoid system breakdown due to virus infection.

Well then, how can you back up your computer in Windows 11? A professional PC backup software should be your good assistant. Here, we strongly recommend using MiniTool ShadowMaker.

This backup software is compatible with Windows 11/10/8/7 and can be used to back up your files, folders, disks, partitions, and Windows systems. In addition, you can use it to clone a hard drive to another disk for disk upgrade or the entire disk backup. Besides, data sync is also supported. Importantly, you can use it to only create backups for the changed or newly added data without taking much disk space.

Now, get MiniTool ShadowMaker by clicking the following download button and install it on your Windows 11 PC for backup.

MiniTool ShadowMaker TrialClick to Download100%Clean & Safe

Step 1: Double-click the icon of this software to launch it.

Step 2: Click Backup and you can see this software backs up the system by default. To create a system image, you can directly go to choose a destination path to continue. If you need to back up files, click Source to go to choose files you need.

Step 3: After selecting backup source and destination, click Back up Now to execute the backup task immediately.

Other Tips to Keep PC Safe

In addition to backing up your files or system, there are some other measures you can take to keep your PC safe:

1. Don’t Visit Suspect Websites
2. Turn on SmartScreen Filter
3. Keep Your Windows Up-to-Date
4. Use a Firewall App
5. Pay Attention to Your Downloaded Files
6. To know more, refer to this post – How to Protect Your Computer from Viruses? (12 Methods).

Wrapping Things up

Is Windows 11 Windows Defender not working or Windows 11 Security not working? After reading this post, you should know how to get rid of this issue. Just try these solutions above to fix your issue. Besides, you had better take some measures to make sure the security of your PC.

If you have any issues or suggestions, you can leave a comment in the following section or send an email to [email protected].