virtualbox.org

Today I reopened an old virtual machine that I hadn't opened in about a week (I used it for a long time) and it worked, I didn't make any other settings on windows / bios, just windows update.
I'm on the latest version of windows, I have the developer version and ubuntu terminal installed (I don't think they have the connection), and when I try to start the virtual machine from the virtualbox it gives me the following error:
Failed to open a session for the virtual machine WIN SV.

Call to WHvSetupPartition failed: ERROR_SUCCESS (Last=0xc000000d/87) (VERR_NEM_VM_CREATE_FAILED).

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

A "VERR_NEM_VM_CREATE_FAILED" error means that some service in Windows 10 that uses Microsoft Hyper-V is active in your host PC OS. In most cases Hyper-V blocks Virtualbox.

To turn Hyper-V off completely, do this:

1. Shut down all programs. You will have to reboot your host.

2. Look into I have a 64bit host, but can't install 64bit guests, 2nd post, points 2 & 3 and ensure that none of these things are running.

3. Find the Command Prompt icon, right click it and choose Run As Administrator.

4. Enter this command:

bcdedit /set hypervisorlaunchtype off

5. Enter this command:

shutdown -s -t 2

6. When the computer turns off, unplug it for 20 seconds. Then plug it in again and boot up Windows 10.

Your Virtualbox should be running now. If Virtualbox still complains of the "VERR_NEM_VM_CREATE_FAILED" error, try all the steps again. If you still have the error, post back exactly what you did and we'll try to help some more.

For further info, see https://www.tenforums.com/tutorials/139 ... puter.html

In the future, to help you get underway getting a solution quick you can try searching for the error text (the CAPITALIZED_UNDERSCORE_SPACED_WORDS) in a web browser with the text "site:forums.virtualbox.org" added to restrict searching to this forum, like this:

VERR_NEM_VM_CREATE_FAILED site:forums.virtualbox.org

Thank you!
Hyper-V with cmd stop working and my vm started!

Good! Glad you're up and running.