Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista.

如何将 IF 函数 (与 Excel 中) AND、OR 和 NOT 函数结合使用，以在给定值之间进行逻辑比较。

Check the Xbox services, games, and apps for any service outages.

Learn how to recover files that have been lost, deleted, or accidentally changed.

Find out how to boot into safe mode in Windows from Settings, the sign-in screen, and a black or blank screen.

了解如何在电脑上安装 Office 2013 或 Office for Mac 2011。

Learn about the recovery options in Windows. Find out how to reset your PC, go back to a previous version of Windows, or use media to reinstall Windows.

Experience Microsoft Copilot on windows devices using the Copilot app! The Copilot app helps you get answers and inspiration from across the web, supports creativity and collaboration, and helps you focus on the task at hand.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Explore your options and settings when you install add-ins.