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：

This article describes a problem with CD or DVD drives not work, or is missing, or not recognized after installing or uninstalling programs.

Touch gestures. You can use these gestures on the touch screen of your Windows 11 device. To turn touch gestures on, select Start > Settings > Bluetooth & devices > Touch > Three- and four-finger touch gestures, and make sure it's turned on.

You can send a meeting request to one or more people. Outlook reserves time on your calendar for the meeting and tracks who accepts the invitation.

Skype Support for All products | Skype Support

In the following illustration, users can assign expenses in an expense report form to multiple categories by selecting check boxes in a multiple-selection list box.

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Learn about Unified Extensible Firmware Interface (UEFI) features and how to access them on Surface Pro models and Surface 3.

Make text, images, and apps bigger on the screen of your Windows computer.

Learn how to create survey forms with Microsoft Forms and easily share them with students, parents, and colleagues.