Locate your product key for Windows 10 or Windows 11. Depending on how you got your copy of Windows 10 or Windows 11, you'll need either a 25-character product key or a digital license to activate it.

If you feel like you’ve been the target of a technical support scam, you can help Microsoft stop cybercriminals by reporting it. Learn more about avoiding technical support scams.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

NAT type on Windows displays "Teredo is unable to qualify". If you can’t connect to an Xbox multiplayer game on Windows 10, go to Settings > Gaming > Xbox Networking. Look for NAT Type. If the status says Teredo is unable to qualify, it means your PC is unable to obtain a Teredo IP address.

If you get an error code while downloading and installing Windows updates, the Update Troubleshooter can help resolve the problem. Select Start > Settings > System > Troubleshoot > Other troubleshooters. Next, under Most frequent, select Windows Update > Run.

Calculation operators and order of operations. Create a simple formula to multiply and divide in an Excel spreadsheet. You can multiply two or more numbers in one cell or multiply and divide numbers using cell references. All formulas in Excel begin with an equal sign (=).

查看此处以了解我们当前正在跟踪的已知游戏问题，并了解可以对其执行的操作。. . 尝试打开指南、打开 Xbox 主机或尝试在 Windows 设备上启动游戏或应用时，会看到以下错误代码和消息：. 出现问题… 0x80070490. 这可能意味着 Xbox 或电脑遇到了意外错误。.

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你尝试在 Xbox One 主机或 Windows 10 设备上下载和安装某游戏时，看到以下错误代码和消息：. 0x80073CF3. 请等待几分钟，然后重试。. 更新失败。. 这说明你的主机或 Windows 10 设备上已存在该游戏的现有版本。.

要查找设备运行的 Windows 版本，请按 Windows 徽标键 + R ，并在“ 打开 ”框中键入“ winver ”，然后选择“ 确定 ”。. 有关详细信息，请参阅以下内容：. 选择“ 开始 ” >“ 设置 ” >“ 系统 ” >“ 关于 ” 。. 在“ 设备规格 ”>“ 系统类型 ”下，查看你运行的 ...