^{(Windows Defender)}Windows 10或Windows 8.1中的Windows Defender设置为使用Windows Update自动下载和安装定义更新，每天一次。如果由于某种原因，您的Windows Defender不会自动更新，或者如果您希望下载并保存定义更新以便在Windows 10/8/7/Vista的不同安装上离线更新Windows Defender，那么这篇文章将对你感兴趣。

我们已经了解了如何手动下载 Windows 更新^{(download Windows Update manually)}。今天，我们将了解如何在Windows 10、Windows 8.1 和Windows 7中手动更新Windows Defender。我还将在帖子中提供下载Microsoft Security Essentials更新的链接。

手动更新 Windows Defender

首先，检查您使用的是 32 位还是 64 位版本的Windows 10/8.1/7。知道设备上安装的Windows版本后，请从以下链接下载安装程序：

• ^(Download)在Windows 10和 Windows 8.1/8中下载Windows Defender的定义更新： 32 位^(32-bit)| 64 位^(64-bit)| 手臂^(ARM)。
• ^(Download)在Windows 7和Windows Vista中^{(Windows Vista)}下载Windows Defender的定义更新：32 位^(32-bit)| 64 位^(64-bit)。
• 下载^(Download)Microsoft Security Essentials的定义更新： 32 位^(32-bit)| 64 位^(64-bit)。

文件下载完成后，转到您的下载位置并双击文件mpam –fe.exe。按照提示安装更新。

您还可以使用 Windows PowerShell 更新 Windows Defender 定义^{(update Windows Defender definitions using Windows PowerShell)}。

如果您认为某些恶意软件正在阻止安装Windows Defender定义更新，您可能需要使用Microsoft Safety Scanner运行扫描，或者使用Windows Defender Offline运行更顽固的恶意软件。

了解如何^{(See how to )}离线更新 Windows 10^{(update Windows 10 offline)}。

这些链接肯定也会让您感兴趣：^{(These links are sure to interest you too:)}

1. 即使禁用了自动 Windows 更新，也要更新 Windows Defender^{(Update Windows Defender even when Automatic Windows Updates is disabled)}
2. Windows Defender 已关闭或无法正常工作^{(Windows Defender is turned off or not working)}
3. 无法打开 Windows Defender。^{(Unable to turn on Windows Defender.)}

How to update Windows Defender manually in Windows 10

Windows Defender in Windows 10 or Windows 8.1 is set to automatically download and install the definition updates using Windows Update, once a day. If for some reason, your Windows Defender will not update automatically, or if you wish to download and save the definition updates in order to maybe update Windows Defender offline, on different installations of Windows 10/8/7/Vista, then this post will be of interest to you.

We have already seen how to download Windows Update manually. Today, we will see how you can update Windows Defender manually in Windows 10, Windows 8.1 and Windows 7. I will also give links for downloading updates for Microsoft Security Essentials in the post.

Update Windows Defender manually

First, check whether you are using a 32-bit or 64-bit version of Windows 10/8.1/7. Once you know the version of Windows installed on your device, download the installers from the following links:

• Download definition updates for Windows Defender in Windows 10, Windows 8.1/8: 32-bit | 64-bit | ARM.
• Download definition updates for Windows Defender in Windows 7 and Windows Vista: 32-bit | 64-bit.
• Download definition updates for Microsoft Security Essentials: 32-bit | 64-bit.

Once the file has finished downloading, go to your download location and double-click the file mpam–fe.exe. Follow the prompts to install the update.

You can also update Windows Defender definitions using Windows PowerShell.

If you think some malware is preventing the installation of Windows Defender definition updates, you may want to run a scan with Microsoft Safety Scanner or for more stubborn malware, using Windows Defender Offline.

See how to update Windows 10 offline.

These links are sure to interest you too:

1. Update Windows Defender even when Automatic Windows Updates is disabled
2. Windows Defender is turned off or not working
3. Unable to turn on Windows Defender.

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