对于针对病毒和恶意软件的基本安全保护，Microsoft在您的Windows 11/10操作系统中内置了Windows Defender 。这意味着您无需安装任何防病毒程序，Windows Defender将处理安全问题。在Windows 11/10中，此安全套件能够与Windows 更新^{(Windows Updates)}一起自动更新反恶意软件定义。

我们已经了解了如何手动安装 Windows Defender 的最新定义^{(how to manually install the latest definitions for Windows Defender)}。今天，在本文中，我们将了解如何使用Windows PowerShell更新^{(Windows PowerShell)}Windows Defender病毒定义。

使用 Windows PowerShell 更新 Windows Defender 定义^{(Update Windows Defender Definitions Using Windows PowerShell)}

1.按Windows Key + Q ，在搜索框中键入Windows PowerShell 。从结果中，右键单击Windows PowerShell并选择Run as administrator。如果系统提示您输入用户帐户密码，请提供该密码。

2.接下来，在Windows PowerShell窗口中打开类型cd..并按Enter键。再次键入cd..然后按Enter键。这样，你应该到了PS C:\>目录。

3.现在您可以在选择参数后键入此 cmdlet，然后按 Enter^(Enter)键。通用 cmdlet（简化）如下所示：

Update-MpSignature [-UpdateSource <UpdateSource> {InternalDefinitionUpdateServer | MicrosoftUpdateServer | MMPC | FileShares} ]

例如，用于简单更新定义的命令是：

PS C:\> Update-MpSignature

这会自动确定哪个是最佳更新源并开始下载定义。

如果要指定更新定义源，则需要更改通用 cmdlet。例如，如果要从Microsoft Update Server 更新^{(Microsoft Update Server)}，可以使用以下 cmdlet：

PS C:\> Update-MpSignature -UpdateSource MicrosoftUpdateServer

您可以使用的其他更新源包括InternalDefinitionUpdateServer、Microsoft Malware Protection Center ( MMPC ) 和 FileShares。

当您使用InternalDefinitionUpdateServer源时，该服务会检查Windows 软件更新服务^{(Windows Software Update Services)}( WSUS ) 服务器上的更新。

希望^(Hope)您发现这篇文章内容丰富且对您有所帮助！

Update Windows Defender definitions using PowerShell

For basic security protection against viruses and malware, Microsoft has built-in Windows Defender in your Windows 11/10 operating systems. This means that you don’t need to install any antivirus programs and Windows Defender will take care of security issues. With Windows 11/10, this security suite has the ability to update antimalware definitions automatically along with Windows Updates.

We have seen how to manually install the latest definitions for Windows Defender. Today, in this article, we’ll see how you can update Windows Defender virus definitions using Windows PowerShell.

Update Windows Defender Definitions Using Windows PowerShell

1. Press Windows Key + Q, type Windows PowerShell in the search box. From the results, right-click on Windows PowerShell and select Run as administrator. If you’re prompted for the user account password, provide that.

2. Next, in the Windows PowerShell window so open type cd.. and hit Enter key. Again type cd.. and then press Enter key. In this way, you should be arrived at PS C:\> directory.

3. Now you can type this cmdlet, after making choice about parameters, and hit Enter key. The general cmdlet (simplified) goes like this:

Update-MpSignature [-UpdateSource <UpdateSource> {InternalDefinitionUpdateServer | MicrosoftUpdateServer | MMPC | FileShares} ]

For example, the command you’ll use to simply update definitions is:

PS C:\> Update-MpSignature

This automatically determines which is the best update source for and begins downloading definitions.

In case, if you want to specify the update definitions source, you need to alter the general cmdlet. For example, if you want to update from Microsoft Update Server, you can use the following cmdlet:

PS C:\> Update-MpSignature -UpdateSource MicrosoftUpdateServer

Other updated sources you can use are InternalDefinitionUpdateServer, Microsoft Malware Protection Center (MMPC) and FileShares.

When you use InternalDefinitionUpdateServer source, the service checks for updates on the Windows Software Update Services (WSUS) server.

Hope you find the article informative and helpful!

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