Olá,
Para que estiver com erro:
==> default: Booting VM...
There was an error while executing `VBoxManage`, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.
Command: ["startvm", "786a1415-fa91-4f34-be51-f4caa499049e", "--type", "headless"]
Stderr: VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: AMD-V is disabled in the BIOS (or by the host OS) (VERR_SVM_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
Pode ser Hyper-V habilitado, é só executar os seguintes comando no prompt como administrador
bcdedit /set hypervisorlaunchtype off
DISM /Online /Disable-Feature:Microsoft-Hyper-V
shutdown -s -t 2
A maquina vai desligar, depois é só ligar e testar.