Learn how to access and manage your Windows sign in options. Use a password, Windows Hello, or a security key to unlock your device.

Learn how to connect to a Wi-fi network in Windows and manage your current network connections.

Learn how to find which version of Windows operating system your PC is running and device specifications.

更改或删除第一页的页眉或页脚. 双击页眉或页脚区域（靠近页面的顶部或底部）以打开“ 页眉和页脚 ”选项卡。. 选中 “其他首页” 以查看是否已选中。. 否则：. 选择“ 首页不同 ”。. 删除第一页上页眉或页脚的内容。. 在页眉或页脚中键入新内容。. 若要 ...

Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

Find out how to submit a request for a refund for a purchase of digital Xbox content.

使用 & 号或 CONCAT 函数，可将多个单元格中的数据合并到一个单元格。 如何在 Excel 中将两个或多个单元格中的文本或数据合并为一个单元格。

Press and hold (or right-click) on the app, then select Uninstall. Uninstall in Settings. Select Start > Settings > Apps > Apps & features . Find the app you want to remove, select More > Uninstall. Note: Some apps can't be uninstalled from the Settings app right now. For help uninstalling these apps, follow the instructions to uninstall from ...

如果某个严重问题导致 Windows 意外关闭或重启，则会出现蓝屏错误（有时也称为黑屏错误或终止代码错误）。 你可能会看到一条消息，指出“Windows 已关闭，以防止损坏你的计算机”或类似消息。 借助提示和资源自行进行疑难解答以解决 Windows 蓝屏错误；如果你需要更多帮助，请联系 Microsoft 支持。

Find help and how-to articles for Windows operating systems, including installation, updates, privacy, security and more.