Microsoft 的Windows Defender 可确保您的 PC^{(Windows Defender ensures your PC is safe)}免受各种威胁。如果此工具停止工作，您的机器将容易受到多种病毒和恶意软件的攻击。以下是解决Defender问题的方法。

Defender停止工作的一个常见原因是您正在使用第三方防病毒程序。其他原因包括损坏的系统文件、过时的Windows版本等等。我们将引导您完成让Defender在您的计算机上工作的步骤。

注意：通常，使用多个完整的防病毒应用程序并不是一个好主意（如果您尝试，大多数都不会正常工作）。但是，您可以将一些反恶意软件应用程序（例如 Malwarebytes）与Windows Defender一起使用来加强防御。

我们假设您已经尝试了基本解决方案（例如使用Defender重试扫描并重新启动您的 PC），但仍然遇到问题。以下方法应该可以帮助您解决问题。

1.更新Windows操作系统^{(Windows Operating System)}

系统中的错误可能会导致Windows Defender无法打开或按预期工作。修复大多数 Microsoft 承认的错误的一种方法是更新您的 Windows 系统^{(updating your Windows system)}。

更新时，您的系统会收到错误修复，这有助于解决计算机的各种问题。有时，您还可以在安装Windows更新时获得新功能。

1. 按Windows + I 启动设置。
2. ^{(Select Update)}在设置中^(Settings)选择更新和安全^(Security)。
3. 选择左侧的 Windows 更新。
4. 选择^{(Select Check)}右侧的检查更新。

1. 安装可用的更新。
2. 重新启动您的电脑。

2.重置Windows安全

当Windows Defender不起作用或行为不端时，重置Windows 安全^{(Windows Security)}应用程序应该是您的第一个故障排除步骤。这很有帮助，因为Defender是Windows 安全^{(Windows Security)}性的一部分，并且将应用程序恢复为出厂值可以解决许多小问题。

重置应用程序将清除应用程序保存的数据。

1. 打开Start，搜索Windows Security，选择右侧的向下箭头图标，然后选择App settings。
2. 向下滚动^(Scroll)页面并选择重置^(Reset)。

1. 在提示中选择重置。

1. ^(Restart)通过启动Start^(Start)、选择Power图标并选择Restart来^(Restart)重新启动您的 PC 。
2. 打开Windows 安全中心^{(Windows Security)}并启用或运行Windows Defender。

3.卸载第三方防病毒程序^{(Antivirus Program)}

当您的 PC 上运行第三方防病毒软件^{(third-party antivirus)}时，Windows Defender 会关闭。您可以尝试删除已安装的防病毒工具，看看是否能解决 Defender 的问题。

删除第三方防病毒程序^{(Antivirus Program)}

您删除防病毒工具，就像您执行其他Windows应用程序一样。

1. 按Windows + I 打开设置。
2. 在设置中选择应用程序。
3. 在列表中选择您的防病毒软件。
4. 选择卸载。

1. 在提示中选择卸载。
2. 重新启动您的电脑。

当您的 PC 打开时，启动Windows 安全中心^{(Windows Security)}并查看Defender是否正常工作。如果问题仍然存在，请尝试清理防病毒软件的剩余文件以解决问题。

删除第三方防病毒软件的剩余文件

Microsoft 已发布清理工具列表^{(list of cleanup tools)}，您可以使用这些工具从 PC 中彻底删除防病毒程序。这些工具深入挖掘您系统的目录，找到与您的防病毒软件相关的文件，然后删除这些文件。

使用 PC 上列表中的适当工具，清除防病毒工具的剩余文件。完成后，重新启动您的 PC。

4.重启安全中心服务^{(Security Center Service)}

Windows使用各种服务来保持 PC 的功能运行。其中之一是与Windows Defender工具相关的安全中心服务。^{(Security Center)}您可以尝试关闭并打开此服务来解决您的问题。

1. 按 Windows + R 打开运行。
2. 键入以下内容并按 Enter：services.msc
3. ^{(Find Security Center)}在右侧的服务列表中找到安全中心。

1. 右键单击安全中心^{(Security Center)}并选择重新启动^(Restart)。

5.从注册表^{(Windows Defender From Registry)}或组策略编辑器^{(Group Policy Editor)}打开Windows Defender

如果您在从Windows 安全应用程序启用^{(Windows Security)}Windows Defender时遇到问题，请尝试使用Windows 注册表^{(Windows Registry)}和本地组策略编辑器^{(Local Group Policy Editor)}等替代方法来激活该工具。

如果您运行的是Windows 家庭^{(Windows Home)}版，请使用Windows 注册表方法。^{(Windows Registry)}如果您使用的是专业版^(Pro)或企业^(Enterprise)版，请使用本地组策略编辑器^{(Local Group Policy Editor)}方法。

从 Windows 注册表激活 Windows Defender^{(Activate Windows Defender From Windows Registry)}

1. 按Windows + R打开Run，在Run框中键入以下内容，然后按 Enter：regedit
2. 在用户帐户控制^{(User Account Control)}提示中选择是。^(Yes)
3. 前往注册表编辑器^{(Registry Editor)}中的以下路径：
   HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows Defender
4. 访问右侧的DisableAntiSpyware条目。^{(DisableAntiSpyware)}如果您没有看到此条目，请右键单击空白处并选择New > DWORD (32-bit) Value来创建它。

1. 在数值^(Value)数据字段中输入 0，然后选择确定。

1. 关闭注册表编辑器。

Windows Defender现在已在您的 PC 上启用。

从本地组策略编辑器^{(Windows Defender From Local Group Policy Editor)}打开Windows Defender

1. 按Windows + R打开Run ，在^(Run)Run中键入以下内容，然后按 Enter：gpedit.msc
2. 在本地组策略编辑器^{(Local Group Policy Editor)}中导航到以下路径：
   Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus
3. 打开右侧的关闭Microsoft ^(Turn)Defender 防病毒条目。^{(Microsoft Defender Antivirus)}

1. 选择禁用^{(Select Disabled)}并选择应用^(Apply)，然后在底部选择确定。

1. 关闭本地组策略编辑器。

Windows Defender 现在已激活。

6.在您的 Windows^{(Your Windows)} PC 上执行干净启动^(Boot)

Windows Defender不工作的一个可能原因是您安装的其他应用程序干扰了该工具。您可以通过干净启动系统^{(clean booting your system)}来验证这一点，它只加载必要的系统文件来打开您的 PC。

如果您可以在干净启动 PC 后启用和使用 Defender，那么您安装的一个或多个应用程序就是罪魁祸首。在这种情况下，请手动验证您的应用列表并删除您认为可疑的应用。

7. 修复 Windows 损坏的系统文件

当Windows系统文件损坏时，您的计算机上会遇到意外问题，包括Defender无法正常工作。幸运的是，Windows包含一个工具，可用于查找和修复计算机上的所有故障系统文件^{(find and fix all the faulty system files)}。

1. 右键单击开始^(Start)并选择命令提示符^{(Command Prompt)}( Admin )。
2. 在用户帐户控制^{(User Account Control)}提示中选择是。^(Yes)
3. 在命令提示符^{(Command Prompt)}中键入以下内容并按 Enter：DISM.exe /Online /Cleanup-image /Restorehealth
   

1. 等待^(Wait)命令完成执行。
2. 接下来，运行以下命令：sfc /scannow
   

1. 等待^(Wait)命令查找并修复有问题的文件。

修复计算机^{(Your Computer)}上损坏的 Windows Defender 工具^{(Broken Windows Defender Tool)}

保持Windows Defender运行至关重要，因为该工具可确保数据的安全。但是，有时，该工具会出现问题并且无法按预期工作。在这种情况下，您可以按照上述方法消除错误。

解决问题后，您可以运行全面扫描^{(run a full scan)}以确保您的计算机上没有威胁。

Windows Defender Not Working? 7 Fixes to Try

Microsoft’s Windows Defender ensures your PC is safe from various threats. If this tool stops working, your machine becomes vulnerable to many types of viruses and malware. Here’s how to resolve problems with Defender.

One common reason Defender stops working is that you’re using a third-party antivirus program. Other causes include corrupt system files, an obsolete Windows version, and more. We’ll walk you through the steps to get Defender working on your computer.

Note: Generally, using more than one full antivirus app isn’t a good idea (and most won’t work right if you try). However, you can use some antimalware apps (such as Malwarebytes) along with Windows Defender to shore up your defenses.

We assume you’ve already tried the basic solutions—like retrying a scan with Defender and restarting your PC—and are still having problems. The following methods should help you resolve your issue.

1. Update the Windows Operating System

A bug in your system can cause Windows Defender not to turn on or work as intended. One way to fix most Microsoft-acknowledged bugs is by updating your Windows system.

When you update, your system receives bug fixes, which help resolve various issues with your computer. Sometimes, you also get new features when you install a Windows update.

1. Launch Settings by pressing Windows + I.
2. Select Update & Security in Settings.
3. Choose Windows Update on the left.
4. Select Check for updates on the right.

1. Install the available updates.
2. Restart your PC.

2. Reset Windows Security

When Windows Defender doesn’t work or misbehaves, resetting the Windows Security app should be your first troubleshooting step. This helps because Defender is part of Windows Security and bringing the app back to factory values resolves many minor issues.

Resetting the app will clear the app’s saved data.

1. Open Start, search for Windows Security, select the down-arrow icon on the right, and choose App settings.
2. Scroll down the page and select Reset.

1. Choose Reset in the prompt.

1. Restart your PC by launching Start, selecting the Power icon, and choosing Restart.
2. Open Windows Security and enable or run Windows Defender.

3. Uninstall the Third-Party Antivirus Program

Windows Defender turns off when a third-party antivirus is running on your PC. You can try removing your installed antivirus tool to see if that fixes Defender’s issues.

Remove a Third-Party Antivirus Program

You remove an antivirus tool like how you do other Windows apps.

1. Open Settings by pressing Windows + I.
2. Select Apps in Settings.
3. Choose your antivirus on the list.
4. Select Uninstall.

1. Choose Uninstall in the prompt.
2. Reboot your PC.

When your PC turns on, launch Windows Security and see if Defender is working. If the issue persists, try cleaning up your antivirus’ leftover files to fix the problem.

Delete a Third-Party Antivirus’ Leftover Files

Microsoft has published a list of cleanup tools that you can use to remove an antivirus program from your PC completely. These tools dig deeper into your system’s directories, find the files associated with your antivirus, and delete those files.

Use the appropriate tool from the list on your PC and get rid of your antivirus tool’s leftover files. When you’re done, reboot your PC.

4. Restart the Security Center Service

Windows uses various services to keep your PC’s functions running. One of these is a Security Center service, which is related to the Windows Defender tool. You can try turning off and turning on this service to resolve your problem.

1. Open Run by pressing Windows + R.
2. Type the following and press Enter: services.msc
3. Find Security Center in the service list on the right.

1. Right-click Security Center and choose Restart.

5. Turn On Windows Defender From Registry or Group Policy Editor

If you have trouble enabling Windows Defender from the Windows Security app, try the alternative methods like Windows Registry and Local Group Policy Editor to activate the tool.

Use the Windows Registry method if you’re running the Windows Home edition. If you’re on the Pro or Enterprise edition, use the Local Group Policy Editor method.

Activate Windows Defender From Windows Registry

1. Press Windows + R to open Run, type the following in the Run box, and press Enter: regedit
2. Select Yes in the User Account Control prompt.
3. Head to the following path in Registry Editor:
   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
4. Access the DisableAntiSpyware entry on the right. If you don’t see this entry, create it by right-clicking anywhere blank and choosing New > DWORD (32-bit) Value.

1. Enter 0 in the Value data field and select OK.

1. Close Registry Editor.

Windows Defender is now enabled on your PC.

Turn On Windows Defender From Local Group Policy Editor

1. Open Run by pressing Windows + R, type the following in Run, and press Enter: gpedit.msc
2. Navigate to the following path in Local Group Policy Editor:
   Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus
3. Open the Turn off Microsoft Defender Antivirus entry on the right.

1. Select Disabled and choose Apply followed by OK at the bottom.

1. Close Local Group Policy Editor.

Windows Defender is now activated.

6. Perform a Clean Boot on Your Windows PC

One possible reason Windows Defender isn’t working is that your other installed apps are causing interference with the tool. You can verify that by clean booting your system, which only loads the essential system files to turn on your PC.

If you can enable and use Defender when you’ve clean booted your PC, one or more of your installed apps are the culprit. In this case, manually verify your app list and remove the apps that you believe are suspicious.

7. Fix Windows’ Corrupt System Files

When Windows system files become corrupt, you experience unexpected issues on your machine, including Defender not working. Luckily, Windows includes a tool that you can use to find and fix all the faulty system files on your computer.

1. Right-click Start and choose Command Prompt (Admin).
2. Select Yes in the User Account Control prompt.
3. Type the following in Command Prompt and press Enter: DISM.exe /Online /Cleanup-image /Restorehealth
   

1. Wait for the command to finish executing.
2. Next, run the following command: sfc /scannow
   

1. Wait for the command to find and fix problematic files.

Fix the Broken Windows Defender Tool on Your Computer

It’s essential to keep Windows Defender running as the tool ensures the safety of your data. However, sometimes, the tool experiences hiccups and doesn’t work as expected. In such a situation, you can follow the above methods to eliminate the error.

Once you’ve fixed the issue, you can run a full scan to ensure no threats are sitting on your computer.

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