A user buys a new device that has the Pro SKU, and the OEM did not install the required feature. Important Defender for Endpoint has been removed from the base image for Windows 11, version 24H2 and needs to be manually installed whenever a device goes from Home to Pro.

发生严重问题时，Windows 11可能会意外关闭或重启，导致你短暂看到错误消息，例如“你的设备遇到问题，需要重启”。 然后，Windows 11将自动重启。 这也称为 停止代码错误、bug 检查、内核错误 或 蓝屏错误、黑屏错误或 BSOD。

查找 Windows 7 或 Windows 8.1 的产品密钥 卸载或重新安装 Windows 7 或 Windows 8.1 时，通常需要产品密钥。 通常，如果购买的是实物 Windows 拷贝，产品密钥应该在标签上或者在 Windows 随附包装盒中的卡上。 如果 Windows 已预先安装在计算机上，产品密钥应显示在设备标签上。 如果你丢失了或者无法找到产品 ...

The Program Install and Uninstall troubleshooter helps you automatically repair issues when you're blocked from installing or removing programs.

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

This page provides support links for home users and support phone numbers for business users.

NOTE Improved diagnostics have been added to detect and report issue details through the event log. Please see KB5016061: Addressing vulnerable and revoked Boot Managers for more information.

在更换硬件后重新激活 Windows 11 当你准备好重新激活时，请确保你的设备已连接到 Internet，然后按照使用数字许可证或产品密钥激活的步骤进行激活。

如果您購買的 Office 或 Microsoft 365 隨附產品金鑰，您可以在下方列出適用於您產品的網站上輸入產品金鑰。 輸入金鑰之後，您可以下載並安裝 Office，也可以為您的 Microsoft 365 訂閱續約。

Learn how to create installation media for installing or reinstalling Windows.