修复无法打开 Windows Defender：(Fix Unable to turn on Windows Defender:) Windows Defender是一个内置的反恶意软件工具，可以检测系统上的病毒和恶意软件。但是，在某些情况下，用户会遇到无法在Windows中打开Windows Defender的情况。这个问题背后的原因可能是什么？有许多用户探索安装任何第三方反恶意软件会导致此问题。
此外，如果您转到Settings > Update & Security > Windows DefenderDefender(Windows Defender)中的实时保护已打开，但它显示为灰色，并且其他所有内容均已关闭，您无法对这些执行任何操作设置。有时主要问题是，如果您安装了第 3 方防病毒(Antivirus)服务，那么Windows Defender会自动关闭。无论这个问题背后的原因是什么，我们都会引导您了解解决这个问题的方法。
为什么我无法打开我的 Windows Defender？(Why can’t I turn on my Windows Defender?)
我们需要了解的一件事是Windows Defender为我们的系统提供了全面的保护。因此，无法打开此功能可能是一个严重的问题。您无法在Windows 10中打开(Windows 10)Windows Defender的原因有很多，例如第三方防病毒软件(Antivirus)可能会干扰、Windows Defender被组策略关闭、日期/时间错误等问题。无论如何(Anyway)，不要浪费任何时间让我们看看如何使用下面列出的故障排除指南解决此问题的根本原因。
修复无法在 Windows 10 中打开 Windows Defender(Fix Unable to turn on Windows Defender in Windows 10)
确保 创建一个还原点(create a restore point) 以防万一出现问题。
方法 1 – 卸载任何第三方防病毒软件(Method 1 – Uninstall any third-party Antivirus software)
Windows Defender无法正常工作的最常见原因之一是第三方防病毒软件。一旦检测到您的系统上安装了任何第三方反恶意软件，Windows Defender就会自动关闭。(Windows Defender)因此，您需要首先开始卸载任何第三方反恶意软件。此外，您需要确保正确完成卸载该软件的所有残留文件，否则它将继续为Windows Defender启动带来问题。您可以使用一些卸载程序软件来删除以前防病毒软件的所有残留物。安装完成后，您需要重新启动系统。
方法 2 – 运行系统文件检查器 (SFC)(Method 2 – Run System File Checker (SFC))
您可以选择的另一种方法是系统文件诊断和修复。您可以使用命令提示符工具检查Windows Defender文件是否已损坏。此外，此工具可修复所有损坏的文件。
1.按 Windows 键 + X 然后选择命令提示符（管理员）( Command Prompt (Admin))。
2. 输入 sfc /scannow并回车。
3.此过程需要一些时间，因此在运行此命令时请耐心等待。
4.如果sfc命令没有解决问题，你可以使用另一个命令。只需(Just)键入下面提到的命令并按Enter：
DISM /Online /Cleanup-Image /RestoreHealth
5.它将彻底扫描并修复损坏的文件。
6.完成这些步骤后，检查您是否能够 修复无法打开 Windows Defender(fix Can’t Turn ON Windows Defender)问题。
方法 3 – 执行干净启动(Method 3 – Perform Clean Boot)
有时有一些第三方应用程序会导致此问题，您可以通过执行干净启动功能轻松找到这些应用程序。
1.按 Windows + R 并键入msconfig并按 Enter。
2.在系统配置窗口(Window)，您需要导航到服务选项卡( Services tab)，您需要在其中选中隐藏所有 Microsoft 服务(Hide all Microsoft Services)，然后单击全部禁用(Disable All)按钮。
3.导航到启动部分(Startup section)，然后单击打开任务管理器。(Open Task Manager.)
4.在这里您将找到所有启动程序。您需要右键单击(right-click)每个程序并一一禁用它们。(Disable)
5.禁用所有启动应用程序后，您需要返回系统配置窗口以保存所有更改( save all the changes)。单击确定。(OK.)
6.您需要重新启动系统并检查您是否能够 修复无法打开 Windows Defender 问题(Fix Can’t Turn ON Windows Defender issue)。
要将问题归零，您需要使用本指南执行干净启动(perform clean boot)并找到有问题的程序。
方法 4 – 重启安全中心服务(Method 4 – Restart Security Center Service)
解决Windows Defender(Windows Defender)问题的另一种方法是重新启动安全中心服务。您需要激活并确保启用了某些服务。
1.按 Windows + R 并键入services.msc并按 Enter
2.在这里您需要搜索安全中心(Security Center)，然后右键单击(right-click)安全中心并选择重新启动(Restart)选项。
3.现在只需重新启动设备并检查问题是否已解决。
方法 5 – 修改您的注册表(Method 5 – Modify your registry )
如果您在打开Windows Defender时仍然发现问题，您可以选择此方法。您只需要修改注册表，但在此之前请确保创建注册表的备份(create a backup of your Registry)。
1.按 Windows + R 并输入regedit。现在按 Enter。
2.在此处打开注册表编辑器后，您需要导航到：
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
3.选择 Windows Defender，然后在右侧窗格中找到 DisableAntiSpyware DWORD。 现在双击这个文件。
4.将数值数据设置为0，点击确定保存设置。
注意：(Note:)如果您遇到权限问题，请右键单击Windows Defender并选择权限。 (Permissions. )请遵循 本指南(this guide)以完全控制或拥有上述注册表项，并再次将值设置为 0。
5. 最有可能的是，完成此步骤后，您的Windows Defender将开始在您的系统上正常工作，而不会出现任何问题。
方法 6 – (Method 6 – )将 Windows Defender 服务设置为自动(Set Windows Defender Service to Automatic)
注意：(Note:)如果Windows Defender服务在服务管理器(Services Manager)中显示为灰色，请按照此帖子(follow this post)操作。
1.按 Windows 键 + R 然后键入services.msc并按 Enter。
2.在服务(Services)窗口中找到以下服务：
Windows Defender 防病毒网络检查服务(Windows Defender Antivirus Network Inspection Service)
Windows Defender 防病毒服务(Windows Defender Antivirus Service)
Windows Defender 安全中心服务(Windows Defender Security Center Service)
3. 双击它们并确保它们的启动(Startup)类型设置为自动( Automatic)，如果服务尚未运行，请单击启动。(Start)
4.单击应用，然后单击确定。
5.重新启动您的 PC 以保存更改并查看您是否能够 修复无法打开 Windows Defender 问题。(Fix Can’t Turn ON Windows Defender issue.)
方法 7 –(Method 7 –) 设置正确的日期和时间(Set Correct Date & Time)
1.单击任务栏上的日期和时间( date and time)，然后选择“日期和时间设置(Date and time settings)”。
2.如果在 Windows 10 上，将“自动设置时间(Set Time Automatically)”设置为“开启(on)”。
3.对于其他人，点击“互联网时间”并勾选“自动与互联网时间服务器同步(Automatically synchronize with Internet time server)”。
4.选择服务器“ time.windows.com ”并点击更新和“确定”。您无需完成更新。只需(Just)单击确定。
再次检查您是否能够 修复 Windows Defender 无法启动问题( Fix Windows Defender Does Not Start issue) ，如果不能，则继续下一个方法。
方法 8 – 运行 CCleaner 和 Malwarebytes(Method 8 – Run CCleaner and Malwarebytes)
1.下载并安装 CCleaner & Malwarebytes。
2.运行 Malwarebytes(Run Malwarebytes)(Run Malwarebytes) 并让它扫描您的系统以查找有害文件。
3.如果发现恶意软件，它将自动删除它们。
4.现在运行 CCleaner ，在“Cleaner”部分的“ Windows ”选项卡下，我们建议检查以下要清理的选项：
5.一旦您确定检查了正确的点，只需单击 Run Cleaner， 然后让 CCleaner 运行。
6.要清理您的系统，请进一步选择注册表(Registry)选项卡并确保选中以下内容：
7.选择Scan for Issue并允许CCleaner扫描，然后单击 Fix Selected Issues。
8.当CCleaner 询问“您要备份对注册表的更改吗？(Do you want backup changes to the registry?)” 选择是。
9.备份完成后，选择Fix All Selected Issues。
10.重新启动您的 PC 以保存更改并查看您是否能够 修复无法打开 Windows Defender 问题。(Fix Can’t Turn ON Windows Defender issue.)
方法 9 –(Method 9 – U)更新 Windows Defender(pdate Windows Defender)
1.按Windows Key + X然后选择命令提示符（管理员）。(Command Prompt (Admin).)
2.在cmd中输入(Enter)以下命令并在每个命令后按Enter：
“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All
“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate
3.一旦命令完成处理，关闭 cmd 并重新启动您的 PC。
方法 10 –(Method 10 – U)更新 Windows 10(pdate Windows 10)
1.按Windows Key + I 打开设置(Settings)，然后单击“更新和安全(Update & Security)”图标。
2.现在从左侧窗格中确保选择Windows 更新。(Windows Update.)
3.下一步，单击“检查更新(Check for updates)”按钮，让Windows下载并安装任何待处理的更新。
受到推崇的：(Recommended:)
希望(Hopefully)以上提到的所有方法都可以帮助您解决无法在 Windows 10 问题中打开 Windows Defender 的问题(Fix Unable to turn on Windows Defender in Windows 10 Issue)。但是，您需要了解应该系统地遵循这些方法。如果您有更多与此问题相关的问题，请在下面留下您的评论。
Fix Can't Turn ON Windows Defender
Fix Unable to turn on Windows Defender: Windows Defender is an inbuilt antimalware tool that detects virus and malware on your system. However, there are some instances when users experience that they are unable to turn on Windows Defender in Windows. What could be the reasons behind this problem? There are many users who explored that installing any third party antimalware software cause this problem.
Also, if you go to Settings > Update & Security > Windows Defender then you will see that the Real-time protection in Windows Defender is turned on but it’s greyed out and also everything else is turned off and you can’t do anything about these settings. Sometimes the main issue is that if you have installed a 3rd party Antivirus service then Windows Defender will shut itself off automatically. No matter what reasons are behind this problem, we will walk you through the methods to solve this problem.
Why can’t I turn on my Windows Defender?
One thing we need to understand that Windows Defender provides complete protection to our system. Therefore, not able to turn on this feature could be a serious problem. There are many reasons for you not being able to turn on Windows Defender in Windows 10 such as third-party Antivirus might be interfering, Windows Defender is turned off by group policy, incorrect date/time issue, etc. Anyway, without wasting any time let’s see How to fix the underlying cause of this issue using the below-listed troubleshooting guide.
Fix Unable to turn on Windows Defender in Windows 10
Make sure to create a restore point just in case something goes wrong.
Method 1 – Uninstall any third-party Antivirus software
One of the most common causes of Windows Defender not working is third-party antivirus software. Windows Defender automatically shuts itself down once it detects any third party anti-malware software installed on your system. Therefore, you need to first start uninstallation any third party antimalware software. Moreover, you need to make sure that uninstallation is done properly all residue files of that software otherwise it will keep creating a problem for Windows Defender to get started. You can use some uninstaller software that will remove all remnants of your previous antivirus. Once the installations finished, you need to restart your system.
Method 2 – Run System File Checker (SFC)
Another method that you can opt for is system file diagnosis and repair. You can use command prompt tool to check whether Windows Defender files are corrupted. Moreover, this tool repairs all corrupted files.
1.Press Windows Key + X then select Command Prompt (Admin).
2.Type sfc /scannow and hit enter.
3.This process takes some time so be patient while running this command.
4.In case sfc command did not resolve the problems, you can use another command. Just type the below-mentioned command and hit Enter:
DISM /Online /Cleanup-Image /RestoreHealth
5.It will scan thoroughly and repair corrupted files.
6.After completing these steps, check if you’re able to fix Can’t Turn ON Windows Defender issue or not.
Method 3 – Perform Clean Boot
Sometimes there are some third party applications cause this problem, you can easily find those ones by performing the clean boot function.
1.Press Windows + R and type msconfig and hit Enter.
2.On the system configuration Window, you need to navigate to Services tab where you need to check to Hide all Microsoft Services and click on the Disable All button.
3.Navigate to Startup section and click on Open Task Manager.
4.Here you will locate all startup programs. You need to right-click on each program and Disable all of them one by one.
5.After disabling all startup applications you need to come back to the system configuration window to save all the changes. Click on OK.
6.You need to reboot your system and check if you’re able to Fix Can’t Turn ON Windows Defender issue or not.
To zero in on the issue you need to perform clean boot using this guide and find the problematic program.
Method 4 – Restart Security Center Service
Another method to get your Windows Defender problem solved is restarting security center service. You need to activate and ensure that certain services are enabled.
1.Press Windows + R and type services.msc and hit Enter
2.Here you need to search for Security Center and then right-click on Security Center and choose Restart option.
3.Now simply restart your device and check if the problem is solved or not.
Method 5 – Modify your registry
If you are still finding the problem in turning on the Windows Defender, you can opt for this method. You just need to modify the registry but before doing so make sure to create a backup of your Registry.
1.Press Windows + R and type regedit. Now press Enter.
2.Once you open the registry editor here you need to navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
3.Select Windows Defender then in the right window pane find DisableAntiSpyware DWORD. Now double click this file.
4.Set the value data to 0 and click OK to save the settings.
Note: If you’re facing permission issues then right-click on Windows Defender and select Permissions. Follow this guide in order to take full control or ownership of the above registry key and again set the value to 0.
5.Most probably, after doing this step, your Windows Defender will start working on your system properly without any problem.
Method 6 – Set Windows Defender Service to Automatic
Note: If Windows Defender service is grayed out in Services Manager then follow this post.
1.Press Windows Key + R then type services.msc and hit Enter.
2.Find the following services in the Services window:
Windows Defender Antivirus Network Inspection Service
Windows Defender Antivirus Service
Windows Defender Security Center Service
3.Double-click on each of them and make sure their Startup type is set to Automatic and click Start if the services are not already running.
4.Click Apply followed by OK.
5.Reboot your PC to save changes and see if you’re able to Fix Can’t Turn ON Windows Defender issue.
Method 7 – Set Correct Date & Time
1.Click on the date and time on the taskbar and then select “Date and time settings.”
2.If on Windows 10, make “Set Time Automatically” to “on.”
3.For others, click on “Internet Time” and tick mark on “Automatically synchronize with Internet time server.”
4.Select Server “time.windows.com” and click update and “OK”. You don’t need to complete update. Just click OK.
Again check if you are able to Fix Windows Defender Does Not Start issue or not, if not then continue with the next method.
Method 8 – Run CCleaner and Malwarebytes
1.Download and install CCleaner & Malwarebytes.
2.Run Malwarebytes and let it scan your system for harmful files.
3.If malware is found it will automatically remove them.
4.Now run CCleaner and in the “Cleaner” section, under the Windows tab, we suggest checking the following selections to be cleaned:
5.Once you’ve made certain the proper points are checked, simply click Run Cleaner, and let CCleaner run its course.
6.To clean your system further select the Registry tab and ensure the following are checked:
7.Select Scan for Issue and allow CCleaner to scan, then click Fix Selected Issues.
8.When CCleaner asks “Do you want backup changes to the registry?” select Yes.
9.Once your backup has completed, select Fix All Selected Issues.
10.Restart your PC to save changes and see if you’re able to Fix Can’t Turn ON Windows Defender issue.
Method 9 – Update Windows Defender
1.Press Windows Key + X then select Command Prompt (Admin).
2.Type the following command into cmd and hit Enter after each one:
“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All
“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate
3.Once the command finish processing, close cmd and reboot your PC.
Method 10 – Update Windows 10
1.Press Windows Key + I to open Settings then click on “Update & Security” icon.
2.Now from the left-hand window pane make sure to select Windows Update.
3.Next, click on “Check for updates” button and let Windows download & install any pending updates.
Recommended:
Hopefully, above mentioned all methods will help you to Fix Unable to turn on Windows Defender in Windows 10 Issue. However, you need to understand that these methods should be followed systematically. In case you have more questions related to this problem leave your comments below.
