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你好
Thank you for posting question on Microsoft Windows Forum.
Based on your query of accidentally deleting Internet Explorer mode from the optional functions and getting the error code 0x8000FFFF when attempting to install it again.
The abovementioned error code is probably a generic Windows error code that can stem from various underlying issues, including corrupted system files or problems with the Windows Update service. The suggestion here is to use Command Prompt to install Internet Explorer mode. You can try the following steps.
- 单击“开始”按钮并键入“cmd”。
- 右键单击搜索结果中的“命令提示符”，然后选择“以管理员身份运行”。
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- 在命令提示符窗口中，运行以下命令。
- DISM /Online /enable-feature /featureName：Internet-Explorer-Optional-amd64
- 命令成功执行后，重新启动计算机以确保更改生效。
希望 以上信息对您有所帮助！如果是的话。自由地点击“接受”，使社区中也有同样问题的其他人受益。