你想要重新安装之前的操作系统：回退到旧版 Windows. 如果你最近升级到了较新的 Windows 版本，但它不适合你，你可以尝试回退。 这会保留你的个人文件，但会删除升级后安装的应用和驱动程序，以及对设置进行的任何更改。

Note: The steps to install the 2019, 2016, or 2013 versions of Office Professional Plus, Office Standard, or a stand-alone app such as Word or Project might be different if you got Microsoft 365 through one of the following: Microsoft Workplace Discount Program (formerly known as Home Use Program): If you bought Microsoft 365 for personal use through your company, see Install Office through ...

使用近似匹配搜索 a 列中的值 1，在 a 列中找到小于等于 1 的最大值 0.946，然后返回同一行中 b 列的值。 2.17 =vlookup(1,a2:c10,3,true) 使用近似匹配搜索 a 列中的值 1，在 a 列中找到小于等于 1 的最大值 0.946，然后返回同一行中 c 列的值。 100 =vlookup(0.7,a2:c10,3,false)

从授权零售商处购买 Windows 11 的盒装副本. 产品密钥. 可在 Windows 11 包装盒内的标签上找到产品密钥。 从授权零售商处购买 Windows 11 的数字副本. 产品密钥. 可在购买 Windows 11 后收到的确认电子邮件中或在可通过零售商的网站访问的数字保险箱中找到产品密钥。

If you’re having sound or audio problems, the following suggestions might help. The tips are listed in order, so start with the first one, see if that helps, and then continue to the next one if it doesn’t.

Tips: While signing in, select Yes at the "Stay signed in?" prompt if you want to go straight to your mailbox next time (not recommended for shared computers). Alternatively, check the "Don't show this again" box and select No to be prompted for your password each time.. If you can't sign in, or have forgotten your username or password, use our sign-in troubleshooter.

Note: If a compatibility issue has been identified on your device that would disrupt your experience using Windows 11, we will temporarily delay your upgrade until the issue is resolved.Compatibility safeguard holds help ensure you have the best experience possible when upgrading and your productivity is not disrupted if critical apps or drivers are not yet compatible.

Microsoft 365 for business If your business subscription plan includes the desktop version of the Microsoft 365 apps you won't see an option to install it unless someone in your organization assigned a license to you.. Learn how to check this in What Microsoft 365 business product or license do I have? or if you're a Microsoft 365 admin responsible for assigning licenses to people in your ...

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

Note: The Wireless Display app is available on devices running Windows 11 version 22H2 and newer.If you're running an earlier version of Windows, launch the Connect app by entering connect in the search box on the taskbar, and selecting Connect in the list of results. To find out which version of Windows you're running, see Which version of Windows operating system am I running?