Learn how to reset your PIN if you aren't signed in to Windows and having trouble using your PIN.

Learn how to reinstall Windows on your PC and how activation works after it's installed.

如果在电脑上安装或更新游戏服务时遇到问题，或者你注意到电脑版 Xbox 应用启动时缺少内容，则可能需要下载并运行适用于电脑的游戏服务修复工具。

Learn how to locate and manage your app permissions on Windows devices. Some apps or games need specific permissions to work properly.

If you need help with Outlook.com, you can read our self-help content, or get support via email.

Learn how to use function VLOOKUP in Excel to find data in a table or range by row. Our step-by-step guide makes vlookup in excel easy and efficient.

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

In the upper left corner of the window, select the app launcher > All apps > SharePoint Tip: If you don't see the SharePoint app under All apps, use the Search box near the top of the window to search for SharePoint.

If you need instructions for adding an email account using advanced settings, go to Use advanced setup to add a POP or IMAP email account in Outlook for PC. Outlook won't accept my password. If Outlook won’t accept your password and you know you’re using the right password for your Gmail account, you might have an older version of Outlook that doesn't currently support this faster Gmail ...

了解如何使用 PIN、面部识别或指纹通过 Windows Hello 登录电脑。