用户在启动 Windows 计算机时可能会在极少数情况下收到缺少操作系统^{(Missing Operating System)}、未找到^{(Operating System Not Found)}操作系统^{(No operating system found)}或未找到操作系统错误屏幕。如果您在启动Windows 11/10/8/7/Vista时经常收到这些消息，那么这篇文章将指导您正确的方向。

找不到缺少的操作系统

在大多数情况下，当您将 Windows Vista或更高版本的操作系统与旧版操作系统一起安装时，就会发生这种情况。例如，Windows XP使用Boot.ini和Vista及更高版本，它是位于Windows\System32文件夹中的BCD Edit.exe 。这里可能有两种情况。

1. 首先，您安装 Windows XP 或之前的操作系统，然后安装Windows 10。在这种情况下，BCD 编辑器^{(BCD Editor)}可能会接管并删除 boot.ini。这使计算机相信只安装了一个操作系统，那就是Windows 10。此类问题可以通过运行BCD 编辑器^{(BCD Editor)}（引导配置数据编辑器^{(Boot Configuration Data Editor)}）来修复。
2. 也许您先安装了Windows 10，然后再安装Windows XP。Windows XP的引导加载程序是默认设置，您不会在操作系统列表中找到Windows 10。在最坏的情况下，您将找不到任何操作系统，因为 boot.ini 和BCD.exe的冲突导致引导加载程序损坏。这种情况也可以使用BCD Editor修复。您只需要知道如何将操作系统添加到引导加载程序，最重要的是，为它们分别分配一个不同的驱动器号。

您将需要使用磁盘启动，然后修复Windows。

这是您可以尝试的。启动Windows 安装媒体^{(Windows Installation Media)}，选择修复^(Repair)，然后 打开命令提示符窗口^{(Open a Command Prompt window)}。在Windows 10中，您还可以通过高级启动选项访问^{(Advanced Startup Options)}命令提示符^{(Command Prompt)}。

现在依次输入以下命令，并在每个命令后按Enter：

bootrec.exe /fixmbr

bootrec.exe /fixboot

bootrec.exe /rebuildbcd

重新启动^(Reboot)您的Windows系统。这应该有望使您的问题消失！

有关更多详细信息，请参阅KB927392并阅读这篇关于Bootmgr is Missing in Windows 的帖子。

如果您收到错误 1962 未找到操作系统消息，您可能需要更换可能有故障的HDD或SATA电缆。

如果您收到未找到应用程序的消息，这篇文章将为您提供帮助。如果您看到无效的系统磁盘，请参阅此帖子，更换磁盘，然后按任意键消息。

相关阅读：^{(Related reads:)}

1. Bootmgr失踪
2. 未找到引导设备
3. 错误 1962，未找到操作系统^{(Error 1962, No operating system found)}。

Missing Operating System Not Found error in Windows 11/10

Users may on rare oсcasions receive Missing Operating System, Operating System Not Found or No operating system found error screen while booting their Windows computer. If you frequently get these messages while booting Windows 11/10/8/7/Vista, then this post will guide you in the proper direction.

Missing Operating System Not Found

In most cases, this happens when you install Windows Vista or later operating systems in conjunction with older operating systems. For example, Windows XP used Boot.ini and Vista onwards it was BCD Edit.exe located in the Windows\System32 folder. There can be two scenarios here.

1. First, you install Windows XP or prior operating systems and then install Windows 10. In this case, the BCD Editor may take over and remove boot.ini. This makes the computer believe that there is only one operating system installed and that is Windows 10. Such issues can be fixed by running BCD Editor (Boot Configuration Data Editor).
2. Maybe you installed Windows 10 first, and then you went on to install Windows XP. The boot loader of Windows XP is made default, and you won’t find Windows 10 in the list of operating systems. In worst case scenario, you won’t find any operating system as the boot loader is corrupt due to conflict of both boot.ini and BCD.exe. This situation too can be fixed using BCD Editor. You just need to know how to add the operating systems to the boot loader and most importantly, assign them each, a different drive letter.

You will need to boot with the disk, and repair Windows.

Here is what you can try. Boot the Windows Installation Media, choose Repair and then Open a Command Prompt window. In Windows 10 you can also access the Command Prompt via Advanced Startup Options.

Now enter the following commands one after the other and hit Enter after each:

bootrec.exe /fixmbr

bootrec.exe /fixboot

bootrec.exe /rebuildbcd

Reboot your Windows system. This should hopefully and have made your problem go away!

For more details see KB927392 and read this post on Bootmgr is Missing in Windows.

If you receive Error 1962 No operating system found message, you may have to replace a possibly faulty HDD or your SATA cable.

This post will help you if you receive an Application not found message. See this post if you see Invalid System Disk, Replace the disk and then press any key message.

Related reads:

1. Bootmgr is Missing
2. Boot Device Not Found
3. Error 1962, No operating system found.

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