Все способы:
- Способ 1: Перезапуск службы «Центр обеспечения безопасности»
- Способ 2: Отключение сторонних антивирусов
- Способ 3: Установка актуальных системных обновлений
- Способ 4: Исправление или сброс приложения «Безопасность Windows»
- Способ 5: Выполнение чистой загрузки Windows
- Способ 6: Проверка параметров реестра
- Способ 7: Проверка целостности системных файлов
- Способ 8: Возвращение Windows в исходное состояние
- Вопросы и ответы: 13
Способ 1: Перезапуск службы «Центр обеспечения безопасности»
Самое простое решение, которое может выполнить каждый пользователь, — перезапустить службу, связанную с «Безопасностью Windows» в Виндовс 11. Это поможет нормализовать работу всех компонентов и обеспечит корректное открытие необходимых окон, если возник небольшой системный сбой.
- Откройте меню «Пуск» и через поиск отыщите приложение «Службы», после чего запустите его.
- В новом окне в конце списка найдите службу с названием «Центр обеспечения безопасности» и щелкните по ней правой кнопкой мыши.
- Из появившегося контекстного меню выберите пункт «Перезапустить» и ожидайте окончания данного процесса. Как только вы получите уведомление о том, что служба успешно перезапущена, можете приступать к проверке работы «Безопасности Windows» и всех связанных с ней компонентов.
Способ 2: Отключение сторонних антивирусов
Следующий метод подразумевает установку ограничений на работу сторонних антивирусов, если такие установлены на вашем компьютере. Функционирование такого рода ПО может напрямую сказываться на штатных средствах операционной системы, вызывая проблемы с их запуском. Вы можете не удалять дополнительный антивирус, а только отключить его на время, чтобы работа всех связанных служб и процессов была завершена. Для получения универсальных инструкций по данной теме рекомендуем перейти к чтению статьи по следующей ссылке.
Подробнее: Отключение антивируса
Способ 3: Установка актуальных системных обновлений
Далее предлагаем остановиться на теме системных обновлений и проверить, есть ли что-то из не установленного в вашей сборке Windows 11. Дело в том, что последнее время Майкрософт активно выпускает различные обновления безопасности и исправления, которые автоматически решают частые проблемы пользователей. Инсталляция апдейтов может помочь вам исправить работу «Безопасности Windows», поэтому попробуйте проверить наличие обновлений.
- Откройте приложение «Параметры», отыскав его значок в списке закрепленных в меню «Пуск».
- На панели слева выберите раздел «Центр обновления Windows» и нажмите кнопку «Проверить наличие обновлений», если в данном окне еще не отображается то, что уже можно установить.
- Подождите, пока сканирование будет окончено. Если обновления найдены, запустите их скачивание и установку. По завершении перезапустите компьютер для окончательной установки оставшихся файлов, затем переходите к проверке работы антивируса или других компонентов безопасности Виндовс.
Способ 4: Исправление или сброс приложения «Безопасность Windows»
То окно, в которое вы хотите перейти для работы с брандмауэром или антивирусом, является отдельным стандартным приложением Windows 11, отображающимся в списке установленных программ. Через этот список можно переключиться в раздел для исправления или сброса приложения, что поможет исправить его сбои. Давайте детально рассмотрим, как осуществляется переход к необходимым опциям и их запуск.
- В том же приложении «Параметры» выберите раздел «Приложения» и перейдите в категорию «Приложения и возможности».
- Найдите «Безопасность Windows», щелкните по трем точкам справа в этой строке и из появившегося меню выберите пункт «Дополнительные параметры».
- Сперва выполните стандартное исправление для восстановления работы приложения. Используйте кнопку «Исправить» и ожидайте появления уведомления об успешном исправлении.
- Проверьте работу «Безопасности Windows», а в случае необходимости вернитесь к предыдущему окну и выполните «Сброс» для удаления данных приложения.
Способ 5: Выполнение чистой загрузки Windows
Существует вероятность, что в вашей операционной системе работают сторонние приложения или утилиты, которые могут влиять на функционирование стандартных средств, включая «Безопасность Windows». Самый простой метод проверки этой теории — выполнение чистой загрузки. Для этого понадобится отключить сторонние службы и программы автозагрузки, что осуществляется так:
- Откройте утилиту «Выполнить», используя стандартную комбинацию клавиш Win + R. В ней введите
msconfigи нажмите Enter для подтверждения выполнения команды. - Данная команда открывает окно «Конфигурация системы», в котором на вкладке «Службы» сначала понадобится поставить галочку возле пункта «Не отображать службы Майкрософт».
- После этого вы увидите список всех сторонних служб и сами сможете решить, какие из них отключить. Если считаете, что ни одна из них не нужна для нормального запуска ОС (за исключением службы видеокарты и процессора), можете нажать «Отключить все».
- Со службами разобрались, теперь самое время посмотреть, какие программы автоматически включаются вместе с Windows 11. Щелкните правой кнопкой мыши по «Пуску» и из меню выберите «Диспетчер задач».
- Перейдите на вкладку «Автозагрузка» и посмотрите, возле каких программ есть состояние «Включено».
- Для отключения автозагрузки конкретной программы щелкните по ней ПКМ и выберите пункт «Отключить». Сделайте то же самое со всеми остальными приложениями, старт которых вместе с ОС не нужен.
Как только вы выполнили все описанные выше действия, отправляйте компьютер на перезагрузку и смотрите, получится ли открыть «Безопасность Windows» в новом сеансе. Если проблема сохранилась, не спешите возвращать все службы и программы автозагрузки в исходное состояние, для начала осуществите рекомендации из следующих методов.
Способ 6: Проверка параметров реестра
Как известно, в реестре есть много разных параметров, связанных с компонентами «Безопасности Windows». Вместе с этим у пользователя есть возможность самостоятельно создавать разные настройки, которые управляют активностью служб безопасности. Мы рекомендуем проверить, есть ли у вас такие параметры, а также изменить их состояние для нормализации работы рассматриваемого приложения.
- Через поиск в «Пуске» отыщите приложение «Редактор реестра» и запустите его.
- В адресную строку вставьте ключ
Компьютер\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defenderи перейдите по нему. - В конечной папке вас интересует параметр с названием «DisableAntiSpyware». Если такой отсутствует, кликните ПКМ в любом пустом месте, наведите курсор на «Создать» и выберите «Параметр DWORD (32 бита)».
- Задайте для нового параметра название
DisableAntiSpywareи дважды кликните по нему для открытия окна изменения состояния. - В нем установите значение 0 и подтвердите внесение изменений. После этого обязательно перезагрузите ПК, чтобы новые настройки вступили в силу.
Способ 7: Проверка целостности системных файлов
Если ни один из перечисленных выше методов не помог решить проблему с доступом к «Безопасности Windows», понадобится запустить проверку целостности системных файлов при помощи стандартных утилит. Они ищут поврежденные или отсутствующие объекты, затем исправляют их и нормализуют работу проблемных компонентов. Детальные инструкции о том, как осуществляется работа с такими системными утилитами, читайте в материале от другого нашего автора далее.
Подробнее: Использование и восстановление проверки целостности системных файлов в Windows
Способ 8: Возвращение Windows в исходное состояние
Завершим статью самым радикальным методом исправления ошибок, который подразумевает возвращение Windows 11 в исходное состояние. Будет выполнена локальная переустановка, а вы сможете решить, сохранять при этом пользовательские файлы или удалять их, чтобы получить «чистую» операционную систему.
- Откройте «Пуск» и перейдите в «Параметры».
- В разделе «Система» кликните левой кнопкой мыши по плитке «Восстановление».
- Возле пункта «Вернуть компьютер в исходное состояние» найдите кнопку «Перезагрузка ПК» и щелкните по ней.
- После перезагрузки решите, нужно ли сохранять пользовательские файлы.
- Затем выберите режим «Локальная переустановка».
- Подтвердите начало процесса, ожидайте возвращения ОС в исходное состояние, затем приступайте к работе с ней, в первую очередь проверив доступ к «Безопасности Windows».
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Quick Tips
- In most cases, repairing or resetting the Windows Security app should get it to work as expected on Windows.
- Restart the Security Center service and scan your PC for corrupt system files using SFC and DISM scans.
- Consider performing a clean boot to check if another app or service is preventing the Windows Security app from opening.
Try Basic Fixes
- Uninstall any third-party antivirus program: Third-party antivirus programs can sometimes interfere with the Windows Security app and prevent it from opening on your Windows 11 PC. To avoid any conflicts, it’s best to disable or uninstall any third-party antivirus program.
- Install Windows updates: Updates are crucial for any operating system and Windows is no exception. Aside from new features and security patches, these updates also carry important bug fixes. You can download and install any available updates and see if that resolves the issue.
Fix 1: Repair or Reset the Windows Security App
Step 1: Click the search icon on the taskbar, type in Windows Security, and select App settings from the right pane.
Step 2: Scroll down to the Reset section and click the Repair button.
If the issue remains even after attempting a repair, repeat the same steps above and click the Reset button.
Fix 2: Reset the Windows Security App Using PowerShell
Several users on the Microsoft forums reported fixing issues with the Windows Security app by resetting it via PowerShell. You can also give this method a shot.
Step 1: Click the search icon on the taskbar. Type in Windows powershell and select Run as Administrator from the right pane.
Step 2: Paste the following command in the console and press Enter.
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
Fix 3: Restart the Security Center Service
Step 1: Press the Windows key + R to open the Run dialog. Type services.msc in the text box and press Enter.
Step 2: In the Services window, scroll down to locate the Security Center service. Right-click on it and select Restart.
Fix 4: Run the SFC and DISM Scans
Step 1: Right-click on the Start icon and select Terminal (Admin) from the list.
Step 2: Type the command mentioned below and hit Enter.
sfc /scannow
Step 3: Run the following commands one by one for the DISM scan:
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth
Wait for the scan to complete and then restart your PC.
Fix 5: Perform a Clean Boot
Step 1: Press the Windows key + R to open the Run dialog, type msconfig in the Open field, and press Enter.
Step 2: Under Services, tick the Hide all Microsoft services checkbox. Then, click the Disable all button.
Step 3: Switch to the Startup tab and click on Open Task Manager.
Step 4: Select a third-party app or program and click the Disable option at the top. Repeat this step to disable all third-party apps and programs.
Restart your PC to enter a clean boot state and try to open Windows Security again. If this solves your problem, look through any recently installed apps and programs and remove them.
Fix 6: Reset Your PC
If all else fails, you can consider resetting your PC as a last resort. Don’t worry, it’s possible to reset Windows 11 without losing your data.
Step 1: Press the Windows key + I to open the Settings app. In the System tab, click on Recovery.
Step 2: Click the Reset PC button.
Step 3: Select the Keep my files option and then follow the on-screen prompts to finish resetting Windows 11.
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When you install Windows 11, Windows Security or Windows Defender becomes the default antivirus and security solution. It is one of the most excellent remedies available, and it is effective in most circumstances.
Nevertheless, one of the most frequently encountered concerns has been that the Windows 11 Windows Security is not opening or functioning as expected after an upgrade or random upgrade.
Why is my Windows Security not opening on Windows 11?
The reasons Windows Security settings are not opening or launching on Windows 11 after upgrading are close to close. Below are the popular reasons:
- Glitches with the app: One of the reasons Windows security is not loading on Windows 11 is some glitches preventing it from opening. The solution here is to reset the app.
- Faulty system files: If the system files meant to load the Windows Security apps are faulty, the app won’t open. You need to repair the system files to fix this.
How can I fix the Windows 11 Windows Security not opening issue?
1. Reset using PowerShell Command
- Right-click on the Start icon and select the Windows Terminal (Admin) option.
- Click the dropdown at the top and select the Windows PowerShell option.
- Copy and paste the command below and hit Enter:
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
- Restart your PC and check if the Windows Security app is now working.
- If it does not work, type the command below and hit Enter to reinstall the app:
Set-ExecutionPolicy UnrestrictedGet-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
You need to reset the app if Windows Security is not working or Windows Defender is not opening. The command below has worked for many. You can reinstall the app using the second command if resetting does not work.
2. Repair the app
- Press the Windows key + I to open the Settings app, choose Apps in the left pane, followed by Apps & features.
- Once you are inside the Apps & features window, search for Windows Security in the search bar from the top, and click on the three-dot menu next to it, followed by Advanced options.
- Scroll down until you find the Reset section, then click on the Repair button to start the repairing process.
Allow the Repair process to finish before rebooting your computer to guarantee your changes are applied. Then, by starting Windows Security, it lets you see if its functionality has been restored.
3. Reset the app
- Press the Windows key + I, go to Apps in the left pane, followed by Apps & features.
- Once inside the Apps & features window, search for Windows Security in the search bar, and click on the three-dot menu. Now click on Advanced options.
- Scroll down until you meet the Reset section, then click on the Reset button.
4. Run SFC
- Press the Windows + S key to open the Search bar, then type cmd, right-click on the most relevant result shown to you, and run it as an Administrator to get full privileges.
- Type in the following command and press Enter to start the process:
sfc /scannow
The process may take some time to finish, so you may need to restart your computer. SFC will automatically find and restore corrupted files and folders. If that does not help, you can try using specialized repair tools, which are much more advanced than Windows built-in tools.
5. Run DISM
- Press the Windows + S key to open the Search bar, then type cmd, and right-click on the most relevant result to run it as an Administrator.
- Paste or type in the following commands and press Enter after each:
DISM /online /Cleanup-Image /ScanHealthDISM /Online /Cleanup-Image /RestoreHealth
Continue to be patient until the process is finished. Be advised that the process could take up to ten minutes to finish. Once you’ve completed this step, restart your computer to ensure the changes take effect.
6. Disable your antivirus
- Click the expand arrow from your taskbar and right-click on your antivirus icon. Now choose Avast shields control followed by Disable for 10 minutes to stop it from interfering.
- If you have other antivirus programs installed, you can temporarily disable the app following the same steps as above or similar ones with a few differences.
With the fixes above, you should be able to fix the Windows Security not opening on Windows 11 issue. If you want to use a third-party tool, check out our post on five of the best antiviruses for Windows 11.
Alternatively, you can look at our article on the best antiviruses with low CPU usage for Windows 11.
If you want to know how to turn on Dev Device protection on your Windows 11 computer, we have a detailed guide to help you with that.
In case you have more issues, don’t miss our guide on how to reinstall Windows Security on Windows 11 for more solutions.
Let us know in the comments section below which solution worked best for you in solving the Windows 11 Windows Defender not working issue and which antivirus software you prefer.
Loredana Harsana
Windows Software Expert
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 on top of the world and she fell in love with tech of all sorts.
Whenever she’s not at her work desk, you’ll find her enjoying refreshing tea flavors, spilling stories on paper, and listening to the radio.
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In this article, you’ll learn what might be preventing Windows Defender from starting, and then we’ll show you step-by-step how to fix the problem: Windows Defender Security not working.
Windows Defender (aka ‘Windows Security’), the built-in antivirus software in Windows 10/11, is crucial for protecting your computer from malware and other online threats. However, there are several factors that can prevent Windows Defender to not start, leaving your system vulnerable.
What can cause Windows security not working problem?
- Conflicting third-party antivirus software: Installing another antivirus program may affect the operation of Windows Defender. In some cases, even if you have uninstalled third-party antivirus programs, the remaining registry entries may still cause Windows Defender to not start.
- Corrupted system files: Damaged or missing system files can disrupt Windows Defender’s functionality.
- Registry or Group Policy modifications: Incorrect registry or group policy changes made by the user or by a malicious program can disable Windows Defender.
How to FIX: Windows Defender Security won’t open on Windows 11/10.
If the Windows Security (aka «Windows Defender») does not start in Windows 10/11, follow these steps in order to fix the problem.
- Uninstall Third-Party Antivirus.
- Scan for Malware and Viruses.
- Perform a Clean Boot.
- Start or Restart the Security Center service.
- Repair Windows System Files.
- Reset Windows Defender from PowerShell.
- Enable Windows Defender in Registry.
- Enable Windows Defender in Group Policy.
- Repair Windows 10/11.
Method 1. Uninstall Third-Party Antivirus.
One of the main reasons that Windows Defender Security cannot start is an installed third-party antivirus program. So, if you have installed a third-party security program, uninstall it, restart your PC and check if the problem remain. *
* Note: Even if you haven’t installed a security software yourself, your computer may have it pre-installed. To see if this is happening:
1. Type «control panel» in the search and then open the Control Panel app and go to Programs > Uninstall a program.
2. Next, look for any installed third-party antivirus and if there is one, select it and click Uninstall.
3. When uninstall is completed, restart your PC and check if the problem remain. *
* Important: Restart your computer even if you haven’t uninstalled any programs. Sometimes Windows Defender-related services may be stuck and not working, but restarting the computer can force them to work properly.
Method 2. Scan for Malware/Viruses.
Before proceeding further, ensure that your computer is clean from viruses and malware. To accomplish this task you can use this Malware Scan and Removal Guide to check and remove viruses or/and malicious programs that may be running on your computer.
After scanning and cleaning your computer for malware, check if the problem persists. If not, you’re done here, otherwise continue to the next step.
Method 3. Perform a Clean Boot.
Sometimes, other applications running in the background can conflict with Windows Defender and prevent it from running. To find out if this is causing the Windows Defender startup problem, start your computer with all third-party services disabled by doing a clean boot using these steps:
Step 1. Disable Startup programs.
1. Press CTRL + SHIFT + ESC to open Task Manager.
2. In the Startup tab, disable (one by-one) all the third-party programs running at Windows Startup. Then reboot your PC.
3. After rebooting, check if the problem remains and if so, proceed to Step-2. If not, reopen the Task Manager and enable one by one the disabled programs and reboot until you find the culprit.
Step 2. Disable Third-Party Services.
1. Press the Windows + R keys to open the ‘Run’ command box.
2. Type msconfig and press Enter to open the System Configuration utility.
3. At Services tab, check the Hide all Microsoft services checkbox.
4. Then press the Disable all button, to disable all non Windows services that start with Windows. When done, click OK and restart your PC.
5. Check if Windows Defender works now. If yes, open ‘msconfig’ again and enable one by one the disabled services and reboot until you find the culprit. If the problem persists, select the the ‘General’ tab, choose Normal Startup, reboot your PC and continue to next method.
Method 4. Start or Restart the ‘Security Center’ service.
To ensure Windows Defender works well, «Security Center» Service should be running.
1. Press the Windows + R keys to open the ‘Run’ command box.
2. Type services.msc and press Enter to open the Services control panel.
3. Find the Security Center service and check if it running. According the result do the following:
- If «Security Center» service is not running, right-click on it and click Start to start the service.*
- If «Security Center» service is running, right-click on it and click Restart.*
* Note: If the «Start» & «Restart» options are inactive (greyed out), skip to next method.
Method 5. Repair Windows System Files.
Repairing Windows system files is a common but important step in solving Windows 10/11 problems like the one mentioned here.
1. Open Command Prompt as Administrator. To do that, type «cmd» or «command prompt» in the search and then click Run as administrator in Command Prompt result.
2. At the command prompt window, copy-paste the following command & press Enter:
- Dism.exe /Online /Cleanup-Image /Restorehealth
3. Be patient until DISM repairs component store. When the DISM operation is completed, copy-paste the command below and press Enter:
- SFC /SCANNOW
4. When SFC scan is completed, restart your computer and check if the problem is fixed.
Method 6. Fix Windows Defender Not Starting using PowerShell.
1. In Windows Search, type PowerShell and select Run as Administrator to open PowerShell as an Administrator.
2. In PowerShell window, copy and paste the following command and then press Enter.*
- Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
* Note: If after giving the above command, you receive the error «package not found» or something similar, give this command instead:
- Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}
3. After command execution, close PowerShell, reboot your PC and try again to open Windows Defender.
Method 7. FIX Windows Defender Not Working in Registry.
1. Press the Windows + R keys to open the Run dialog box.
2. Type «regedit» and press Enter to open the Registry Editor.
2. In Registry, navigate to this location:
- HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
3. At the right pane double-click to open the DisableAntiSpyware REG_DWORD value.*
* Note: If the «DisableAntiSpyware» value doesn’t exist, skip to next step or do the following:
- Right-click on empty space, and choose New > DWORD (32-bit) Value.
- Rename the «New Value #1» to «DisableAntiSpyware« and press Enter.
- Continue to next step.
3. Set the Value data to 0 to enable Windows Defender and then press OK.
4. Close the Registry Editor and reboot your PC.
Method 8. Enable Windows Defender in Group Policy.
Sometimes, Windows Defender is disabled because of a group policy that disables it, either set by the user or by malware. *
* Note: This method applies only to Windows 10/11 Professional Editions.
1. Press Windows + R keys to open the Run dialog.
2. Type gpedit.msc and press OK.
2. In the Local Group Policy Editor, navigate to:
- Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus.
3a. Double-click to open the Turn off Windows Defender Antivirus policy in the right pane.
4. In the window that appears, choose Not Configured or Disabled and then click Apply and OK.
5. Close the Group Policy Editor and restart your PC.
Method 9. Repair Windows with an In-place Upgrade.
If, after following the methods above, you’re still having problems, your last option is to repair Windows with an in-place upgrade. To do this, use the instructions in one of these tutorials, depending on your version of Windows.
- How to Repair Windows 10 with an In-Place Upgrade.
- How to Repair Windows 11 with an In-Place Upgrade.
That’s it! Which method worked for you?
Let me know if this guide has helped you by leaving your comment about your experience. Please like and share this guide to help others.
If this article was useful for you, please consider supporting us by making a donation. Even $1 can a make a huge difference for us in our effort to continue to help others while keeping this site free:
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Konstantinos is the founder and administrator of Wintips.org. Since 1995 he works and provides IT support as a computer and network expert to individuals and large companies. He is specialized in solving problems related to Windows or other Microsoft products (Windows Server, Office, Microsoft 365, etc.).
It’s frustrating when you want to run a virus scan on your PC, and the Windows Security app won’t launch. Various items can cause the app to behave this way. However, you can take a few troubleshooting steps to resolve the problem.
A few reasons your Windows Security app won’t launch are that the app’s configuration is faulty, your Windows version is outdated, Windows system files are corrupt, and more.
1. Close Other Antivirus Programs on Your PC
Windows Security doesn’t launch because you’re using another antivirus program on your PC. That tool may be interfering with Windows Security’s functionalities, causing the app not to launch.
In this case, you can close your other antivirus program and try to open the Windows Security app. Try force-closing your other program to ensure it’s fully closed.
- Right-click your Start menu icon and select Task Manager.
- Right-click your antivirus program on the list and choose End task.
- Launch Windows Security.
If Windows Security launches after disabling your third-party antivirus tool, you can remove that tool from your PC to ensure you don’t face the same issue again. Here’s how to do that.
- Open Windows Settings by pressing Windows + I.
- Select Apps in the left sidebar and Apps & features on the right pane.
- Find your antivirus program on the list, select the three dots next to the program, and choose Uninstall.
- Select Uninstall in the prompt to confirm your action.
- Restart your PC by opening the Start menu, selecting the Power icon, and choosing Restart.
2. Restart the Windows Security Center Service
Windows runs various services in the background to support your PC’s multiple functions. It’s possible a service related to Windows Security is not working correctly, preventing the app from launching.
In this case, you can restart the relevant background service to fix your issue.
- Open the Run dialog box by pressing Windows + R.
- Type the following in the box and press Enter:
services.msc - Find and right-click Security Center on the services list and choose Restart.
- Quit the Services window, then open your Windows Security app.
3. Repair the Windows Security App
Like many other apps, Windows Security can become problematic due to faulty configuration and other technical items. When this happens, you can use your PC’s built-in repair tool to try to repair the app.
- Open your PC’s Settings app by pressing Windows + I.
- Select Apps in the left sidebar and Apps & features on the right pane.
- Find Windows Security on the app list, select the three dots next to the app, and choose Advanced options.
- Select Repair on the following screen.
- When you’ve repaired the app, launch the app.
4. Reset the Windows Security App
If repairing Windows Security didn’t fix the app’s launch problem, you can go a step further and reset the application. Doing so clears all the current settings of the app, resolving your app problem.
- Open the Start menu, find PowerShell, and select Run as administrator.
- Select Yes in the User Account Control prompt.
- Type the following command on the PowerShell window and press Enter:
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
- Close the PowerShell window when the command has finished running.
- Launch the Windows Security app.
5. Update Your Windows Version
Your Windows operating system version may be outdated, causing your system and installed apps to malfunction. So, you should always use the latest version of your system software.
You can resolve your issue by updating Windows to the most recent version on your PC.
- Press Windows + I to open Settings.
- Select Windows Update in the left sidebar.
- Choose Check for updates on the right pane.
- Allow Windows to find available updates.
- Download and install all the displayed updates.
- Reboot your PC.
6. Fix Corrupt Windows Files
Windows system files can corrupt, causing your system functions, stock apps, and even third-party apps to malfunction. These files become corrupt for many reasons, including viruses and malicious apps.
Fortunately, Windows includes a built-in tool to help you fix corrupt system files on your computer. You can run a tool called SFC (System File Checker) from Command Prompt to find and fix all the problematic and missing core files on your PC.
- Open the Start menu, locate Command Prompt, and select Run as administrator.
- Select Yes in the User Account Control prompt.
- Enter the following command on the CMD window and press Enter. This command downloads the files required to fix your PC.
DISM.exe /Online /Cleanup-image /Restorehealth
- Run the following command to begin scanning for and fixing corrupt Windows files:
sfc /scannow
- Restart your PC when SFC has fixed the faulty files.
7. Reset Your Windows PC
If Windows Security doesn’t launch even after following all the above methods, your system’s core configuration might be corrupt. One way to deal with this situation is to reset your PC.
Resetting your PC deletes all your custom configurations and apps, fixing nearly all the issues on your computer. Note that you’ll lose your apps while resetting the PC, so ensure you’re okay with that.
- Open Settings by pressing Windows + I.
- Select System in the left sidebar and Recovery on the right pane.
- Choose Reset PC next to Reset this PC.
- Select Keep my files to ensure Windows doesn’t delete your files.
- Choose Local reinstall to reset your PC locally.
- Follow the on-screen reset instructions and finish bringing your PC back to the factory settings.
- Launch Windows Security when you’ve reset your PC.
Resolve Windows Security’s Launch Issues Using Various Methods
If you can’t open Windows Security, that means you can’t run virus scans, enable or disable your antivirus protection or firewall, or perform other security-related tasks in the app. This problem makes your PC vulnerable to various threats.
Luckily, fixing the app’s launch issues isn’t too tricky. As outlined above, you can make a few changes on your PC to resolve your issue.
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