如果VirtualBox未启动来宾操作系统并显示Failed to open session for the virtual machine, E_FAIL (0x80004005)，请按照本文查找解决方案。VirtualBox还可能显示虚拟机在启动期间意外终止，退出代码为 1 (0x1)，VirtualBox 日志文件消息中可能提供更多详细^{(The virtual machine has terminated unexpectedly during startup with exit code 1 (0x1), More details may be available in VirtualBox log file)}信息。如果您收到此错误消息，这里有一些建议可以解决您的问题。

无法打开虚拟机的会话
VT-x不可用 ( VERR_VMX_MO_VMX )
E_FAIL (0x80004005)

VirtualBox无法为虚拟机打开会话

如果VirtualBox VM 没有打开或启动^{(VirtualBox VM is not opening or starting)}，那么要解决此问题，您需要执行以下步骤：

1. 以管理员身份打开 VirtualBox
2. 安装平台包
3. 放弃保存的状态
4. 重新安装 VirtualBox

1]以管理员身份打开VirtualBox

尽管默认情况下管理员权限不是强制性的，但有时您可能需要使用它来解决此问题。如果您有VirtualBox的桌面快捷方式，并使用该快捷方式打开该工具，您可以在对应的logo上右击，选择以管理员身份运行^{(Run as administrator)}。但是，如果您想永久为VirtualBox提供管理员权限，则需要按照以下步骤操作。

右键单击^{(Right-click)}桌面快捷方式并转到Properties。之后，切换到兼容性^{(Compatibility )}选项卡。

在这里，您应该找到一个复选框，显示以管理员身份运行此程序^{(Run this program as an administrator)}。在该复选框中打勾，然后单击“确定^{(OK )}”按钮以保存更改。

但是，如果您没有桌面快捷方式并且从“开始”菜单打开^(Start)VirtualBox，您可以执行以下操作。您可以搜索VirtualBox，右​​键单击确切的搜索结果，然后选择Run as administrator。

此外，如果您想授予此“开始^(Start)”菜单按钮的管理员权限，以下步骤将对您有所帮助。在任务栏^(Taskbar)搜索框中搜索 VirtualBox，然后选择打开文件^(VirtualBox)位置^{(Open file location)}。基本上，您需要在 Windows 计算机中打开 Startup 文件夹^{(open the Startup folder in Windows computer)}并转到Oracle VM VirtualBox。

之后，右键单击Oracle VM VirtualBox图标，然后转到Properties > Compatibility选项卡并选中以管理员身份运行此程序^{(Run this program as an administrator)}复选框。

这样做之后，您应该不会遇到前面提到的问题。

修复^(Fix)：由于 Hyper-V VirtualBox 错误，原始模式不可用^{(Raw-mode is unavailable courtesy of Hyper-V VirtualBox error)}。

2]安装平台包

平台包帮助VirtualBox轻松使用各种组件。如果您还没有安装它，您可以前往此页面^{(this page)}，并为您的操作系统下载最新的平台包。

3]丢弃保存的状态

如果您没有关闭VirtualBox或未正确运行虚拟机，则可能会出现此类问题。因此，使用Discard Saved State选项杀死所有正在运行的进程，并立即关闭应用程序。或者，您可以选择虚拟机，然后按Ctrl + J。

4]重新安装VirtualBox

如果以上建议都不能帮助您解决问题，唯一的解决方案是重新安装VirtualBox。不要忘记在重新安装之前删除所有剩余部分。

我希望这些解决方案对您有所帮助。^{(I hope these solutions will be helpful to you.)}

接下来，我们将看看如果VirtualBox 无法注册和打开硬盘映像文件^{(VirtualBox failed to register & open Hard Disk image file)}，您该怎么办。

VirtualBox failed to open session for the virtual machine - 0x80004005

If VirtualBox is not starting the guest OS and it displays Failed to open session for the virtual machine, E_FAIL (0x80004005), follow this article to find out the solution. VirtualBox might also show The virtual machine has terminated unexpectedly during startup with exit code 1 (0x1), More details may be available in VirtualBox log file message. If you get this error message, here are some suggestions that will fix your problem.

Failed to open session for the virtual machine
VT-x is not available (VERR_VMX_MO_VMX)
E_FAIL (0x80004005)

VirtualBox failed to open session for the virtual machine

If VirtualBox VM is not opening or starting, then to fix this problem, you will need to undertake the following steps:

1. Open VirtualBox as administrator
2. Install platform package
3. Discard saved state
4. Reinstall VirtualBox

1] Open VirtualBox as administrator

Although administrator privilege is not mandatory by default, sometimes you might need to use that to fix this problem. If you have a desktop shortcut of VirtualBox and you use this shortcut to open this tool, you can right-click on the corresponding logo, and select Run as administrator. However, if you want to provide the admin permission to VirtualBox permanently, you need to follow these steps.

Right-click on the desktop shortcut and go to Properties. After that, switch to the Compatibility tab.

Here you should find a checkbox saying Run this program as an administrator. Make a tick in that checkbox and click the OK button to save the change.

However, if you do not have a desktop shortcut and you open VirtualBox from the Start menu, here is what you can do. You can search for VirtualBox, right-click on the exact search result, and select Run as administrator.

Also, if you want to give admin permission to this Start menu button, the following steps will help you. Search for VirtualBox in the Taskbar search box, and select Open file location. Basically, you need to open the Startup folder in Windows computer and go to Oracle VM VirtualBox.

After that, right-click on the Oracle VM VirtualBox icon, and go to Properties > Compatibility tab and select the Run this program as an administrator checkbox.

After doing this, you should not get the problem as mentioned earlier.

Fix: Raw-mode is unavailable courtesy of Hyper-V VirtualBox error.

2] Install platform package

The platform package helps VirtualBox to use various components with ease. If you haven’t installed it yet, you can head over to this page, and download the latest platform package for your OS.

3] Discard saved state

If you haven’t closed the VirtualBox or running the virtual machine properly, there is a chance of getting such an issue. Therefore, use the Discard Saved State option to kill all the running processes, and close the app immediately. Alternatively, you can select the virtual machine, and press Ctrl + J.

4] Reinstall VirtualBox

If none of the above suggestions helped you to fix the problem, the only solution is the reinstallation of VirtualBox. Do not forget to remove all the leftovers before installing it again.

I hope these solutions will be helpful to you.

Next, we will see what you can do if VirtualBox failed to register & open Hard Disk image file.

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