VirtualBox: Failed to open a session for the virtual machine

When encountering the error “Failed to open a session for the virtual machine” in VirtualBox, there might be an easy solution.

Error

Failed to open a session for the virtual machine Zorin.

Unresolved (unknow) host platform error. (VERR_UNRESOLVED_ERROR).

Result Code: E_FAIL (0X80004005)
Component: ConsoleWrap
Interface: IConsole {6ac83d89-6ee7-4e33-8ae6-b257b2e81be8}
VirtualBox E_FAIL (0X80004005)
VirtualBox Error: E_FAIL (0X80004005)

Solution

  1. Open the command prompt as an administrator:
    Press “Win + R” to open the Run dialog, type “cmd” and press “Ctrl + Shift + Enter“.
  1. Check if the hypervisorlaunchtype is set to auto or is missing at all.
    bcdedit
bcdedit CMD
The hypervisorlaunchtype is set to Auto.
  1. Turn the hypervisorlaunchtype off and restart the computer:
    bcdedit /set hypervisorlaunchtype off
  1. Turn the hypervisorlaunchtype on again by setting it to auto and restart the computer:
    bcdedit /set hypervisorlaunchtype auto
  1. Launch VirtualBox
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