Microsoft Defender是一个反恶意软件程序，预装在最新的Windows系统上。也称为Windows Security或Windows Defender Antivirus，它会定期接收更新。它利用安全情报定义来识别病毒和其他威胁。有时Windows Defender定义未正确更新，这可能会导致安全问题。在本文中，我们为您带来了一个有用的指南，它将教您如何在Windows中启动^(Windows)Windows Defender定义更新以及如何执行 Windows Defender 定义下载。

如何执行 Windows Defender 定义更新

如何执行 Windows Defender 定义更新^{(How to Perform Windows Defender Definition Update)}

Windows Defender定义是应保持更新的授权程序，因为它提供以下功能

系统性能报告
^(Virus)实时病毒和威胁检测^{(Threat Detection)}
防火墙和网络保护
防范钓鱼网站
文件阻塞

我们将从一个简单的 Windows 更新开始，因为它可能导致 Windows Defender 定义更新，之后我们将转向其他方法。

方法一：执行自动更新^{(Method 1: Perform Automatic Update)}

自动更新是使Windows 安全^{(Windows Security)}中心保持最新的一种方便快捷的方法。默认情况下，此操作会获取最新版本并将其安装在Windows Defender 安全^(Security)软件上。要手动更新 Windows Defender^{(Manually Update Windows Defender)}，请按照以下步骤操作：

1. 同时按下Windows + I keys 打开设置^(Settings)。

2. 点击更新和安全^{(Update & Security)}。

更新和安全选项。如何执行 Windows Defender 定义更新

3. 单击Windows 安全性^{(Windows Security)}。

Windows 安全选项

4. 选择病毒和威胁防护^{(Virus & Threat Protection)}。

病毒和威胁防护选项。如何执行 Windows Defender 定义更新

5. 如果您有更新的驱动程序，您将看到消息You're up to date，如果没有，它会显示Updates Available。

6. 如果可用，更新将自动开始下载。

7.升级完成后，您可能需要重新启动 PC 。^{(restart your PC)}

它将自动更新Windows防御者定义。

另请阅读：^{(Also Read:)} 修复 Windows 更新安装错误 0x8007012a^{(Fix Windows Update Install Error 0x8007012a)}

方法 2：使用命令提示符^{(Method 2: Use Command Prompt)}

您可以使用命令提示符^{(Command Prompt)}和几行代码来执行Windows Defender定义更新。^{(Windows Defender)}请按照以下步骤操作。

1. 按Windows 键^{(Windows key)}，键入命令提示符^{(Command Prompt)}并单击 以管理员身份运行^{(Run as Administrator)}。

搜索中的命令提示符选项。

2. 键入以下命令并按Enter 键^{(Enter key)}。它用于清除缓存数据。

"%ProgramFiles%\Windows Defender\ MpCmdRun.exe" -removedefinitions –dynamicsignatures

命令提示符中的代码行。如何执行 Windows Defender 定义更新

3. 之后，键入以下命令并按Enter 键^{(Enter key)}。这是更新防御者定义的更新命令。

"%ProgramFiles%\Windows Defender\ MpCmdRun.exe" -SignatureUpdate

在 cmd 或命令提示符下运行 Windows Defender 签名更新命令

等待^(Wait)命令完成处理，然后将完成 Windows Defender 定义更新。

另请阅读：^{(Also Read:)} 如何阻止或取消阻止 Windows Defender 防火墙中的程序^{(How to Block or Unblock Programs In Windows Defender Firewall)}

方法 3：使用 Windows PowerShell^{(Method 3: Use Windows PowerShell)}

与命令提示符类似，您可以在^{(Command Prompt)}PowerShell中运行一些代码来更新 Windows Defender 定义。请按照以下步骤执行相同操作。

1. 按Windows 键^{(Windows key)}，键入Windows PowerShell，然后单击以管理员身份运行^{(Run as Administrator)}。

搜索中的 Windows PowerShell

2. 键入以下命令^(command)并按Enter 键^{(Enter key)}。

"%ProgramFiles%Windows DefenderMpCmdRun.exe" -removedefinitions -dynamicsignatures

注意：^{(Note: )}有时此命令会出错，但不会停止更新。在任何情况下都继续执行下一个命令。

在 windows powershell 中删除定义和动态签名命令

3. 之后，输入给定的命令^(command)并按Enter 键^{( Enter key)}。

注意：^(Note:)输入第一个命令后，等待 >>出现在屏幕上。只有在那之后输入这个命令。

"%ProgramFiles%Windows DefenderMpCmdRun.exe" -SignatureUpdate.\

windows powershell 签名更新命令

此方法可能并不总是有效，因为Windows 10不断更改更新命令，但您可以尝试更新 Windows Defender 定义。

方法 4：手动下载更新^{(Method 4: Download Updates Manually)}

您可以按照以下步骤从Microsoft 安全智能^{(Microsoft Security Intelligence)}下载页面手动下载Windows Defender定义更新。

1. 转到Microsoft 安全智能更新^{(Microsoft Security Intelligence updates)}网页。

2. 在手动下载更新^{(Manually download the update)}部分下，导航到适用于 Windows 10 和 Windows 8.1 的 Microsoft Defender Antivirus^{(Microsoft Defender Antivirus for Windows 10 and Windows 8.1)}。

手动下载更新

3. 现在选择与您的系统兼容的32 位^(32-bit)或64 位^(64-bit)选项。

32 位和 64 位选项。如何执行 Windows Defender 定义更新

4.将下载一个名为mpam-fe.exe的文件。^{(mpam-fe.exe)}

5.右键单击它并以管理员身份运行^{(Run as Administrator)}。

6.等待^(Wait)几秒钟，更新将完成。

注意：运行^(Note:)mpam-fe.exe后不会打开任何屏幕或弹出窗口，但请放心，更新将开始处理。

常见问题 (FAQ)^{(Frequently Asked Questions (FAQs))}

Q1。Windows Defender 能胜任这项任务吗？^{(Q1. Is Windows Defender up to the task?)}

回答：^{(Ans: )} Windows Defender提供了足够的网络安全保护，但远远低于最昂贵的防病毒软件的质量。如果您只需要基本的网络安全保护， Microsoft Windows Defender^{(Microsoft Windows Defender)}就足够了。

Q2。什么是最好的网络防御系统？^{(Q2. What is the best cyber defense system?)}

答：^{(Ans: )}对您的设备和网络最有效的网络防御之一是实时保护。它检查已知恶意软件数据库的任何可能威胁，例如病毒和木马^(Trojans)，并防止它们在有机会这样做之前造成伤害。

Q3。Microsoft Windows Defender 是否免费提供？^{(Q3. Is Microsoft Windows Defender available at no cost?)}

答：^{(Ans: )}Microsoft Defender Antivirus是^{(Microsoft Defender Antivirus)}Windows 10中包含的免费恶意软件防护程序。Microsoft Defender Antivirus以前称为Windows Defender ，通过有效但简单的实时反恶意软件保护来保护单个Windows PC 。^{(Windows PCs)}

受到推崇的：^{(Recommended:)}

修复 Netflix 错误代码 UI3012^{(Fix Netflix Error Code UI3012)}
修复 Windows 10 中的蓝牙驱动程序错误^{(Fix Bluetooth Driver Error in Windows 10)}
如何在 Windows 10 上重置 Windows 更新组件^{(How to Reset Windows Update Components on Windows 10)}
如何在 Windows 10 上更新网络适配器驱动程序^{(How to Update Network Adapter Drivers on Windows 10)}

我们希望本指南对您有所帮助，并且您能够进行Windows Defender 定义更新^{(Windows Defender definition update)}，我们还介绍了如何进行 Windows Defender 定义下载。让我们知道哪种方法最适合您。如果您有任何疑问或建议，请随时将它们放在评论部分。

How to Perform Windows Defender Definition Update

Microsoft Defender is an аnti-malware program that comеs pre-installed оn recеnt Windows systems. Also known as Windows Seсurity or Windows Dеfender Antivirus, it receives updates regularly. It utilizes security intelligеnce dеfinitions to identify viruses and othеr threats. Ѕometimes Windows Defender definition is not updated properly which can cause security iѕsues. In this article, we bring to you a helpful guide that will tеach you how to start Windows Defender definition update in Windows and how to perform windowѕ defender definitіon downlоad.

Windows Defender Definition is an authorized program that should be kept updated as it provides the following features

Reports of System Performance
Virus and Threat Detection in real-time
Firewall and Network protection
Protection against phishing sites
File blocking

We will begin with a simple windows update as it can result in windows defender definition update and after that we will move to other methods.

Method 1: Perform Automatic Update

Automatic updates are a convenient and quick method to keep Windows Security up to date. By default, this operation gets the most recent version and instals it on the Windows Defender Security software. To Manually Update Windows Defender, follow the steps below:

1. Press the Windows + I keys together to open Settings.

2. Click on Update & Security.

Update and Security option. How to Perform Windows Defender Definition Update

3. Click on Windows Security.

Windows Security option

4. Select Virus & Threat Protection.

Virus and Threat Protection option. How to Perform Windows Defender Definition Update

5. If you have the updated drivers you will see the message You’re up to date and if you don’t it will say Updates Available.

6. The updates will start downloading automatically if they are available.

7. You may need to restart your PC when the upgrades are completed.

It will automatically update Windows defender definitions.

Also Read: Fix Windows Update Install Error 0x8007012a

Method 2: Use Command Prompt

You can perform Windows Defender definition update by using Command Prompt and a few lines of code. Follow the steps below.

1. Press the Windows key, type Command Prompt and click on Run as Administrator.

Command Prompt option in Search.

2. Type the following command and hit Enter key. It is used to clear cache data.

"%ProgramFiles%\Windows Defender\ MpCmdRun.exe" -removedefinitions –dynamicsignatures

Code line in Command Prompt. How to Perform Windows Defender Definition Update

3. After that, type the following command and hit Enter key. This is the update command which will update defender definitions.

"%ProgramFiles%\Windows Defender\ MpCmdRun.exe" -SignatureUpdate

run windows defender signature update command in cmd or command prompt

Wait for the commands to finish processing and after that windows defender definition update would be done.

Also Read: How to Block or Unblock Programs In Windows Defender Firewall

Method 3: Use Windows PowerShell

Similar to Command Prompt, you can run some codes in PowerShell to make windows defender definition update. Follow the steps below to do the same.

1. Hit the Windows key, type Windows PowerShell, and click on Run as Administrator.

Windows PowerShell in Search

2. Type the following command and press Enter key.

"%ProgramFiles%Windows DefenderMpCmdRun.exe" -removedefinitions -dynamicsignatures

Note: Sometimes this command gives an error but it won’t stop the updates. Continue with next command in any case.

remove definitions and dynamic signatures command in windows powershell

3. After that, type the given command and press Enter key.

Note: Wait for >> to appear on the screen after entering the first command. Only after that enter this command.

"%ProgramFiles%Windows DefenderMpCmdRun.exe" -SignatureUpdate.\

windows powershell signature update command

This method may not work always as Windows 10 keeps changing the update commands but you can give it try to update windows defender definition.

Method 4: Download Updates Manually

You can manually download Windows Defender definition update from Microsoft Security Intelligence download page by following the steps below.

1. Go to Microsoft Security Intelligence updates webpage.

2. Under Manually download the update section, navigate to Microsoft Defender Antivirus for Windows 10 and Windows 8.1.

Manually download the update

3. Now select 32-bit or 64-bit whichever option is compatible with your system.

32 bit and 64 bit option. How to Perform Windows Defender Definition Update

4. A file named mpam-fe.exe will be downloaded.

5. Right-click on it and Run as Administrator.

6. Wait for a few seconds and the updates will be done.

Note: No screen or pop-up window will open after running mpam-fe.exe but rest assured the updates will begin processing.

Frequently Asked Questions (FAQs)

Q1. Is Windows Defender up to the task?

Ans: Windows Defender provides adequate cybersecurity protections, but it falls well short of the quality of the most expensive antivirus software. Microsoft Windows Defender can suffice if you only want basic cybersecurity protection.

Q2. What is the best cyber defense system?

Ans: One of the most effective cyber defenses for your device and network is the real-time protection. It examines any possible threats to a database of known malware, such as viruses and Trojans, and prevents them from inflicting harm before they have a chance to do so.

Q3. Is Microsoft Windows Defender available at no cost?

Ans: Microsoft Defender Antivirus is a free malware prevention program included with Windows 10. Microsoft Defender Antivirus, formerly known as Windows Defender, protects individual Windows PCs with effective but simple real-time anti-malware protection.

Recommended:

We hope that this guide was helpful and you were able to make Windows Defender definition update, we also covered how to do windows defender definition download. Let us know which method worked for you the best. If you have any queries or suggestions then feel free to drop them in the comments section.

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About the author

我是一名专业的音频工程师，拥有超过 10 年的经验。我参与过各种各样的项目，从小型家庭音响系统到大型商业制作。我的技能在于创造出色的配乐和声音处理工具，让音乐听起来很棒。我对 Windows 10 也非常有经验，可以帮助您充分利用您的计算机系统。

如何执行 Windows Defender 定义更新

如何执行 Windows Defender 定义更新^{(How to Perform Windows Defender Definition Update)}

方法一：执行自动更新^{(Method 1: Perform Automatic Update)}

方法 2：使用命令提示符^{(Method 2: Use Command Prompt)}

方法 3：使用 Windows PowerShell^{(Method 3: Use Windows PowerShell)}

方法 4：手动下载更新^{(Method 4: Download Updates Manually)}

How to Perform Windows Defender Definition Update