必填： 旧 Windows 版本的更新需要安装 SHA-2 代码签名支持。 (KB4493730 和 KB4474419) 年 4 月和 5 月发布的支持是必需的，才能继续接收这些版本的 Windows 的更新。 目前，所有旧版 Windows 更新签名都从 SHA1 和双 (SHA-1/SHA-2) 更改为 SHA-2。 Windows Server 2008 SP2. 2019 年 7 月 16 日

注意: 如果你拥有的是套件，如 Microsoft 365 家庭版、Office 家庭和学生版 2016 或 Office 家庭和学生版 2013，请搜索套件名称，即便你只想修复 Word 或 Excel 等特定应用程序。如果你拥有的是独立应用程序，如 Word 或者 Excel，请搜索应用程序名称。

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

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 ...

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?

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.

To create the installation media, here's what you'll need: A PC with a reliable internet connection. The download time will vary, depending on your internet connection.

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.

How to redeem a gift card, Xbox download code or token. Both Microsoft and Xbox gift cards and download codes and tokens work the same way: once redeemed to your Microsoft account, you can spend your balance at Microsoft Store online, on Windows or Xbox, and you can get downloads for the latest apps, games, movies, TV shows, and Surface, Xbox, and accessories.

To check activation status in Windows 11, select the Start button, and then select Settings > System and then select Activation .. Your activation status will be listed next to Activation.. Check activation status in Settings. You'll see one of these activation status messages on the Activation page: