x64 Virtual machine is keeps stuck when booting

Discussions related to using VirtualBox on Windows hosts.
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GonzaloAlvarezGiannerini
Posts: 2
Joined: 5. Jul 2022, 02:18

x64 Virtual machine is keeps stuck when booting

Post by GonzaloAlvarezGiannerini »

Hi,

I have a Windows 10 Virtualmachine.

After (I think) certain Windows 10 updates de virtual machine stop booting; it stays stuck and it won't open at all.

I really don't know why is this happening.

I hope you can help me.

Sincerely,
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: x64 Virtual machine is keeps stuck when booting

Post by scottgus1 »

Try setting the VM to 2 processors if it is not already.

If that doesn't work, right-click the guest in the main Virtualbox window's guest list, choose Show Log.

Search the far left tab's log for this text:

Attempting fall back to NEM

If you find it, Hyper-V is enabled. You have two options:

1. Try the 6.1.35 test build. Save the test build installer until you update again later. You'll need it if your host's MSI installation database goes south (they do) and the installer will not be available for download after the next even-number version gets released.

2. Turn off Hyper-V. See HMR3Init: Attempting fall back to NEM (Hyper-V is active).

If you don't find that text, save the far left tab's log, zip the log file, and post the zip file, using the forum's Upload Attachment tab.
GonzaloAlvarezGiannerini
Posts: 2
Joined: 5. Jul 2022, 02:18

Re: x64 Virtual machine is keeps stuck when booting

Post by GonzaloAlvarezGiannerini »

Hi,

It was difficult to disable something so easy.

I had to run the cmd and follow the steps on the article you suggested.

The key was to disable the Windows Defender's Core Isolation.

I does not make sense because I have always had this feature on, probably the updates of the software had something to do with this.

Why do you think?.

Thanks for the information it was quite useful and solved the problem.
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: x64 Virtual machine is keeps stuck when booting

Post by scottgus1 »

Windows does update things that turn on Hyper-V; we see such reports all the time.

Glad you're up and running!
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