Все способы:
- Способ 1: Использование других методов открытия
- Способ 2: Исправление или сброс приложения
- Способ 3: Установка недостающих пакетов через «PowerShell»
- Способ 4: Восстановление и переустановка через «PowerShell»
- Способ 5: Проверка системных обновлений
- Способ 6: Проверка целостности системных файлов
- Способ 7: Возвращение Windows 11 к исходному состоянию
- Вопросы и ответы: 1
Способ 1: Использование других методов открытия
Перед тем как вы перейдете к реализации более сложных методов, позволяющих восстанавливать работу «Защитника Windows» в Виндовс 11, советуем попробовать один из других вариантов открытия классического приложения. Возможно, у вас возникли проблемы только с конкретным методом или не удается найти нужную кнопку, поэтому альтернативные варианты могут оказаться полезными. Детальнее о них читайте в материале по следующей ссылке.
Подробнее: Как открыть Windows Defender в Windows 11
Способ 2: Исправление или сброс приложения
«Защитник Windows» является классическим приложением и представлен в ОС точно так же, как и другие стандартные программы. Для него тоже поддерживаются настройки и дополнительные параметры, среди которых можно отыскать сброс и исправление. Мы рекомендуем использовать эти инструменты в первую очередь, поскольку от вас требуется просто их запустить.
- Откройте «Пуск» и перейдите в «Параметры», кликнув по значку с изображением шестеренки.
- Далее в разделе «Приложения» выберите категорию «Приложения и возможности».
- В списке программ найдите «Безопасность Windows», справа в этой строке кликните по трем точкам для вызова меню, из которого выберите пункт «Дополнительные параметры».
- В блоке «Сбросить» сначала рекомендуем щелкнуть по «Исправить», чтобы запустить автоматический процесс восстановления.
- Если после него вы все еще не видите нужное вам приложение или испытываете трудности с его запуском, нажмите «Сброс», а по завершении повторите попытку перейти к стандартному антивирусу.
Способ 3: Установка недостающих пакетов через «PowerShell»
Этот вариант следует попробовать, если при выполнении предыдущего вы даже не нашли приложение с названием «Безопасность Windows». Это может означать, что оно просто отсутствует в операционной системе или файлы являются поврежденными. Для установки недостающих компонентов понадобится воспользоваться «PowerShell». Только учитывайте, что вместе с Защитником будут добавлены и пакеты других стандартных программ, отсутствующих в вашей сборке или удаленных вручную.
- Щелкните правой кнопкой мыши по «Пуску» и из появившегося контекстного меню выберите пункт «Терминал Windows (Администратор)».
- Введите команду
Set-ExecutionPolicy Unrestrictedдля получения списка недостающих пакетов. - После ее выполнения используйте
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}и нажмите Enter для применения. - Начнется процесс поиска и инсталляции файлов. Это может занять много времени, что зависит от количества отсутствующих пакетов и скорости вашего интернета. Как только вы увидите сообщение об успехе, попробуйте перезагрузить ПК и снова поискать Windows Defender на вашем компьютере.
Способ 4: Восстановление и переустановка через «PowerShell»
Следующий метод снова подразумевает использование консоли, но на этот раз команда будет всего одна и предназначена она исключительно для работы с «Защитником Windows». Она проверит его файлы, а при их отсутствии произведет повторную установку, что часто позволяет наладить работу стандартного компонента.
- Обязательно запускайте «Терминал Windows» от имени администратора, как это было показано в предыдущей инструкции.
- Введите команду
Get-AppxPackage Microsoft.SecHealthUI-AllUsers | Reset-AppxPackageи нажмите Enter для ее применения. - Через несколько секунд на экране должна появиться новая строка ввода. Это означает, что операция уже завершена, а вы можете переходить к проверке работы «Безопасности Windows».
Способ 5: Проверка системных обновлений
Сейчас очень активно выходят обновления для Windows 11, особенно это относится к различным апдейтам KB, связанным с безопасностью. Определенные из них вносят исправления в работу «Защитника Windows», что может вернуть компонент и наладить его запуск конкретно в вашем случае. Понадобится найти системные и необязательные обновления, затем произвести их инсталляцию.
- В «Параметрах» выберите раздел «Центр обновления Windows» и запустите процесс поиска апдейтов.
- Параллельно с этим можете перейти к просмотру необязательных обновлений, среди которых тоже могут быть патчи безопасности.
- Щелкните по списку «Необязательные обновления» для его открытия. Если апдейты будут найдены, отметьте их галочками и подтвердите инсталляцию (обновления драйверов в этом случае можно пропустить).
Способ 6: Проверка целостности системных файлов
Нередко причиной отсутствия или неудачного запуска «Защитника Windows» становятся поврежденные или отсутствующие системные файлы. Если ничего из перечисленного выше не помогло вам решить ситуацию, рекомендуем запустить системные утилиты, которые как раз и предназначены для сканирования и исправления подобных проблем. Детально о них рассказывает другой наш автор в своей статье по следующей ссылке.
Подробнее: Использование и восстановление проверки целостности системных файлов в Windows
Способ 7: Возвращение Windows 11 к исходному состоянию
Прибегать к реализации этого метода стоит в тех случаях, когда при помощи предыдущих вам так и не удалось вернуть «Защитник Windows» в операционную систему. Возможно, его установка изначально прошла неуспешно по каким-то причинам или вы используете пиратскую сборку ОС, где компонент просто отсутствует. Можете попробовать выполнить переустановку путем возвращения Виндовс к исходному состоянию. Для этого не нужны специальные программы, обойтись можно штатным средством.
Подробнее: Сброс Windows 11 к заводским настройкам
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This PowerShell command reinstalls Windows Defender in seconds
Updated on September 22, 2022
What to Know
- You don’t need to download Windows Defender, because it’s integrated into Windows 11.
- Enter this in a PowerShell window: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage.
- Or, go to Settings > Apps > Installed apps > Windows Security > three dots > Advanced options > Reset.
This article explains when and how to reinstall Windows Defender through the command line or Settings app in Windows 11.
How to Reinstall Windows Defender in Windows 11
Windows Defender (aka, Microsoft Defender) isn’t installed on your computer like a typical program, so you can’t reinstall it like you can regular software. Instead, follow these directions to use a PowerShell command to get the job done. It might take anywhere from 5 seconds to a few minutes to complete. If you can open Settings normally, there’s an easier method after these steps.
-
Right-click the Start button and select Terminal (Admin).
If that doesn’t work for whatever reason, use the search bar on the taskbar to search for PowerShell, and then right-click it to find the Run as administrator option.
-
Copy the command exactly as it’s shown here, and then right-click in the PowerShell window to paste it (Ctrl+V works, too):
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage -
Press Enter to immediately start the process to reset Windows Defender to its original settings so that it performs as a freshly installed app.
-
You’ll know when it’s finished because you’ll see the blinking cursor again on a new line below the command you entered. In the meantime, you might briefly see a Deployment operation progress message.
If you see lots of red text, and an «Access is denied» message, return to step 1 and make sure you’re opening PowerShell as an administrator.
Another way to reset Windows Defender is through Settings. If Settings opens fine for you, you don’t need to bother with a PowerShell command. Instead, go to Settings > Apps > Installed apps > Windows Security > three dots > Advanced options > Reset.
When to Reinstall Windows Defender
Technically, you’re not really reinstalling the program because Windows doesn’t actually let you uninstall it. That said, you might run the above command to reset Windows Defender if it’s just not working correctly.
The most obvious sign you need to do this is if you see an error when you try to open it. If it’s not opening as it should, and you see this message, the above command should fix it right away:
You'll need a new app to open this windowsdefender linkLook for an app in the Microsoft Store
Or, maybe it does open, but some of its toggles won’t turn on or off, or you can’t even find a link to it on your computer. In these cases, the PowerShell command should refresh the tool back to working order.
Windows Defender Might Just Be Off
It’s possible that you’ve considered reinstalling Windows Defender because it isn’t catching malware, when in reality, it’s just not turned on. You might think it’s been uninstalled or is broken, but really it’s just disabled.
This is completely possible since Windows 11 lets you turn off its built-in antivirus program if you’d rather not use it.
Learn how to turn Windows Defender on and off for specific directions.
FAQ
-
Not really. While Windows Defender provides basic protection from threats, it’s no substitute for third-party antivirus software.
-
Go to Start > Settings > Privacy & Security > Windows Security > Virus & threat protection. Under Virus & Threat Protection Settings, select Manage settings, then under Exclusions, select Add or remove exclusions.
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FILE
Windows 11 has its antivirus, but if it encounters issues, you might need to reinstall Windows Security on Windows 11, and this guide will show you a few ways to do it
How do I reinstall Windows Defender in Windows 11?
1. Use Windows PowerShell
- Right-click on the Start button and select Windows Terminal (Admin) from the menu.
- Copy and paste the below command in the Terminal and hit Enter:
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
- Once the command is successfully executed and it generates the success message, exit the Terminal.
Alternatively, you can use the following command instead: PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage WindowsDefender).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register -ForceApplicationShutdown $manifest}
Using these commands, you should be able to repair Windows Security in Windows 11.
2. Reset Windows Security via Settings
- Press the Windows key + X and select Apps and Features.
- Locate Windows Security, click the three dots next to it, and choose Advanced options.
- Next, click on Reset and click Reset again to confirm.
How do I reset Windows Security in Windows 11?
You can achieve this from the Settings app, by following the guides from Solution 2 of this guide.
- Microsoft Defender will allow SOC teams and admins to refine the threat detection process
- How to Delete Windows 11 Saved Passwords
- How to Download DirectX 12 Agility SDK [Installation Guide]
- How to Open PPTX File in Windows 11? Use These 4 Ways
You can try these methods if Windows Security is not opening in Windows 11 or if Windows Defender is missing. However, if the problem persists, your only option might be to reset Windows 11 or use a different antivirus software.
As for other issues, we wrote a guide on what to do if Windows Defender turns off on Windows 11, so don’t miss it for more information.
What method do you use to reinstall Windows Defender on Windows 11? Let us know in the comments section below.
Madhuparna Roy
A diploma holder in computers and with a keen interest in technology, Madhuparna is passionate about writing How-to guides and helping people solve the most intricate Windows issues.
It all started with the evolution of mobile phones and Google, and that has now settled with Windows.
Windows Defender is the default anti-malware program on every Windows PC. Users complain about Windows Defender missing in action from their computers for various reasons. Common causes of such issues include security program conflicts or corrupted files. Interestingly, you can find effective solutions to the Windows Defender missing problem within a few steps. In addition, you can also seek an alternative for safeguarding your data under any circumstance. Let’s solve the problem of the missing Windows Defender.
See also:
Windows Defender Download
Quick Solutions
Microsoft Defender is one of the leading anti-malware services available on Windows. Therefore, it is also referred to as Windows Defender in many cases. However, you may end up missing the Windows Defender on your computer on certain occasions.
You wouldn’t want to miss the most powerful antivirus program associated with Windows 11. Most importantly, it is an essential tool for the safety of your computer from numerous threats such as viruses, malware attacks, spyware, and other issues. If Windows Defender does not work, you don’t have to panic. The following post will outline a few simple solutions for the missing Windows Defender on your Windows 11 PC.
Causes of Missing Windows Defender on Windows 11
The best way to solve the problem of Windows Defender involves the identification of the causes of the problem. Why don’t you see the Windows Defender protecting your system against malicious threats? The most common reasons for the missing Windows Defender include deleted Windows Defender files or conflicts with another security program. Some other reasons are listed below:
- You don’t have the latest updates for Windows 11.
- The time and date on your computer are incorrect.
- You have turned off Windows Defender manually.
- A system configuration error prevents Windows Defender from launching.
- Windows Defender has been turned off due to a Group Policy.
📖Read Also: Windows 11 Virus & Threat Protection Not Working
For example, if you have installed new antivirus software, it can interfere with the working of Windows Defender. Generally, you would find the following common causes for which Windows Defender is not visible on your system.
Full Analysis: Is Windows 11 Need Any Antivirus
Regardless of having built-in Windows Defender, antivirus software is essential to keep malware and spiteful attacks at bay! Consider using the EaseUS Todo Backup tool for complete PC protection.
How to Fix Windows Defender Missing Windows 11 Problem
As you can notice, the different causes for the missing Windows Defender problem are pretty trivial. With a keen eye for detail, you can identify these causes and resolve the issue with simple troubleshooting methods. For example, you can try resetting Windows Defender as the first solution. However, if you don’t find any likely results with the simple solutions, you can try the following solutions.
- Method 1. Re-enable Windows Defender If It’s Disabled
- Method 2. Restart Your System
- Method 3. Check for System Updates
- Method 4. Download and Run Microsoft Safety Scanner
- Method 5. Reinstall Defender from the Microsoft Website
Method 1. Re-enable Windows Defender If It’s Disabled
You can use the following steps to enable Windows Defender manually if it has been disabled by accident.
Step 1. Open «Settings» and access «Privacy & Security».
Step 2. Select «Windows Security» and click «Virus & threat protection».
Step 3. Open the Manage Settings link and enable «Real-Time Protection with Windows Defender».
Method 2. Restart Your System
One of the standard solutions for almost every problem is to restart your system. Here are the simple steps to restart your system.
Step 1. Save all your work.
Step 2. Click on the «Windows» button
Step 3. Then click on the «Power» button, and then choose the «Restart» option.
Method 3. Check for System Updates
The lack of the latest updates can also be one of the common reasons for Windows Defender not working on your system. Here are a few easy steps to check for Windows updates.
Step 1. Open Windows settings using «Win» and «I» keys.
Step 2. Find «Windows Update» on the left-hand side of the screen and click on it.
Step 3. Look for the «Check for updates» option and click on it for running Windows updates manually.
Method 4. Download and Run Microsoft Safety Scanner
Microsoft Safety Scanner is a powerful tool tailored to identify and remove malware from Windows systems. You can download it and run a scan with the following steps.
Step 1. Download Microsoft Safety Scanner from the official Microsoft Support website and complete the installation process according to the instructions.
Step 2. Once you have completed the installation process, you will find three different scanning options: Quick scan, Full scan, and Customized scan.
Step 3. Depending on the type of scan you select, the Microsoft Safety Scanner would take several minutes for the scanning process.
Method 5. Reinstall Defender from the Microsoft Website
If the above solutions don’t work out, you must choose the final resort, i.e., reinstalling Windows Defender. Microsoft Defender is not available directly through the website, but you can download it using Windows terminal or PowerShell.
Step 1. Open Windows Terminal with admin permission.
Step 2. Copy-paste the following command and press the Enter key.
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
Step 3. It will install and fix any problem related to Defender in Windows.
Once done, search for Windows Defender in the Start Menu and open it. Make sure to setup the real-time protection.
Keep Data From Viruses Attack Even Windows Defender Go Missing
The problem of missing Windows Defender can have critical consequences for your computer. Without the default anti-malware protection tool, your system will likely be vulnerable to viruses and malware attacks. However, you need to note that whether you solve the issue of a missing Windows Defender or not, your data is at risk.
Therefore, your priority should be safeguarding your data above everything else. EaseUS Todo Backup tool can offer an exclusive opportunity for you to relax regarding data backup and security.
EaseUS Todo Backup is a powerful, one-stop destination for all your data backup requirements. You can easily take data backup from disks, files, operating systems, and partitions and store it according to your preferences. It also ensures easier data recovery to ensure you always have control over your data. However, the most crucial feature of EaseUS Todo Backup is called Security Zone. It’s a tool that creates a secret partition on your computer that cannot be explored or changed by the user or third-party apps or the Windows itself. This feature allows EaseUS Todo Backup to help protect your important data from ransomeware.
You can follow the steps listed below to keep your data from viruses attack even Windows Defender go missing.
Step 1. Select Backup Contents
On the main window, click the big question mark button to select backup contents. You can choose to back up individual files, entire disk or partition, operating system and mails.
Step 2. Select Security Zone as Backup Destination
While selecting backup destination, you can see the Security Zone option. Click Security Zone and use it as a backup destination.
However, if you’re first to use the Security Zone function, EaseUS Todo Backup will guide you to create one. Click «Create Security Zone«.
Choose a partition with enough free space for your backups and then click «Continue«.
You can adjust the partition size for the security zone. Click «Create» to get it done.
Step 3. Execute the backup task
Click «Backup Now» to start the backup process. Your backups of OS, files, drives and mails in the security zone will be fully protected from being seen or destroyed by virus, ransomeware and trojan.
Bottom Line
The curious case of a missing Windows Defender can be annoying and troublesome if left unchecked. You don’t want to risk your valuable data to unprecedented malware attacks, viruses, or other threats. Therefore, you must identify the causes of the problem, such as a conflicting security program. Subsequently, you must implement the necessary troubleshooting methods and check whether Windows Defender works. Above everything else, you can ensure secure backup of your data with EaseUS Todo Backup, a reliable tool for safe data backup and recovery.
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- Is Windows Security Missing Windows 11/10? See How to Fix!
Is Windows Security Missing Windows 11/10? See How to Fix!
By Vera | Follow |
Last Updated
Is Windows Security missing in Windows 11/10 after upgrading to this OS or installing a Windows update? If this annoying issue comes up unexpectedly, what should you do? In this post, MiniTool gives you multiple solutions to help you out.
Windows Security, also known as Windows Defender, is an inbuilt antivirus program in Windows 11 and Windows 10 that helps to protect your PC against virus attacks and malicious software. It offers real-time protection to keep the PC safe.
However, after upgrading to Windows 11/10 or installing an update, the issue of Windows Security Windows 10/11 appears. Even it cannot be found in apps and features. Why you can’t find Windows Security? The possible reasons for this could be corrupted files, a security program conflict, a registry issue, etc.
Thankfully, fixing this issue is not hard if you follow the solutions below. Let’s get started.
Tips:
Windows Security Center missing Windows 11 is one of the numerous problems. In the past, users have complained that Windows Security keeps turning off, Windows Security keeps turning on, Windows Security is not working, and more.
How to Fix Windows Security App Missing Windows 11/10
Install Windows Security via PowerShell
If you can’t find Windows Security on your PC, you can try to reinstall this antivirus software by using PowerShell. This way is proved to be useful for many impacted users. See how to do this thing to fix Windows Security not in apps and features:
Step 1: Right-click on the Start icon in Taskbar and choose Windows Terminal (Admin) in Windows 11 or Windows PowerShell (Admin) in Windows 10. Alternatively, press Win + R, type powershell, and press Ctrl + Shift + Enter to run the command-line tool with admin rights.
Step 2: Click Yes if asked by the UAC window.
Step 3: Type Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage into the window and press Enter.
If this command couldn’t work for you, execute the command: Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}. This helps to reinstall all your native Windows applications.
Update Windows 11/10
Windows updates bring some fixes for bugs and errors in the previous versions, so you can also have a try if Windows Security is missing in Windows 11/10. Besides, an incomplete/incorrect installation of the system could trigger the issue of Windows Security dashboard missing. If you check for updates correctly, this could also solve the problem.
Just press Win + I to launch the Settings app. Then, click Update & Security > Windows Update in Windows 10 or Windows Update in Windows 11, check for available updates, and install them.
Check Group Policy Settings
Windows Security missing Windows 11/10 may be caused by incorrect group policy settings. So, go to check the settings:
Step 1: Type gpedit.msc into the search box and click the exact result to open Local Group Policy Editor.
Step 2: Navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus.
Step 3: Locate Turn off Microsoft Defender Antivirus, double-click on it, and make sure it is set to Not Configured. Then, restart your PC and check if Windows Security can open and work.
Run a System Restore
If you find Windows Security missing after installing an update in Windows 11/10, you can also try to run a system restore to revert the PC to its previous state.
Step 1: Type create a restore point into the search box and click the result to open the System Properties window.
Step 2: Click System Restore to continue.
Step 3: Click Next and choose a restore point based on the time.
Step 4: Confirm the restore details and click Finish to start the restore process.
These are the common fixes for the issue – Windows Security missing Windows 11/10. If you find other useful workarounds, you can share them with us in the comment part below. Thanks a lot.
Besides, to keep your PC data safe, it is a good way to create a backup for crucial data since viruses and malware sometimes cannot be detected by the antivirus software and eventually infect your PC. To back up data, you can choose to use the professional and reliable free backup software, MiniTool ShadowMaker. It supports automatic, incremental and differential backups. Just click the button to get it for a trial.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
About The Author
Position: Columnist
Vera is an editor of the MiniTool Team since 2016 who has more than 7 years’ writing experiences in the field of technical articles. Her articles mainly focus on disk & partition management, PC data recovery, video conversion, as well as PC backup & restore, helping users to solve some errors and issues when using their computers. In her spare times, she likes shopping, playing games and reading some articles.