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即使已开启其他防火墙，开启 Microsoft Defender 防火墙也很重要。它保护你免遭未经授权的访问。若要打开或关闭 Microsoft Defender 防火墙，请执行以下操作：

Learn how to troubleshoot USB-C problems in Windows and fix USB devices, ports, and adapters not working properly.

Learn how to use a health report in Windows Security to manage your device performance and keep your device secure.

The Program Install and Uninstall troubleshooter helps you automatically repair issues when you're blocked from installing or removing programs.

Learn how to locate, install, and share files with custom fonts compatible with Microsoft Office applications.

Applies To: Office 2021, Office 2021 for Mac, Office 2019, Office 2019 for Mac, Office 2016

Erfahren Sie, wie Sie Office 2013 auf Ihrem PC oder Office für Mac 2011 installieren können.

Applies To: Office 2019, Office 2016, Office 2016 for Mac, Office 2013

Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.

Learn how to download, install, and configure additional language packs for your version of Windows.

The following tables compare some key features between various versions of Visio. To see which version you are using, go to "My account" on office.com, then search that page for Visio.

Applies To: Visio Plan 2, Visio in Microsoft 365, Visio Plan 1, Visio Professional 2021, Visio Standard 2021, Visio Professional 2019, Visio Standard 2019, Visio Professional 2016, Visio Standard 2016, Visio 2013

可通过不同的方式删除应用和程序，因此如果找不到要查找的应用和程序，可以尝试另一个位置。请注意，某些应用和程序内置于 Windows 中，无法卸载。