Hey, if you all of the suddend have your windows 10 host machine running very slow. Take a look at the V icon at the bottom of the windows, if you notice a small green turtle, then that means that micrsoft hypervisor is running. This is something enabled automatically if you installed a program like docker. If so, this breaks virtualbox. To fix it, you need to disabled it. Follow these instructions.

  1. Shutdown your virtual machine guest
  2. Open powershell with administrator and run this command:
  3. bcdedit /set hypervisorlaunchtype off
  4. Reboot your host
  5. Start your guest machine.
  6. Notice the green turtle is gone and your windows is running normal now.

Thats it.