Docker toolbox installation error

[Nitkap]

I am getting the following error while installing Docker Toolbox.

Starting "default"...
(default) Check network to re-create if needed...
(default) Windows might ask for the permission to configure a dhcp server. Sometimes, such confirmation window is minimized in the taskbar.
Unable to start the VM: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe startvm default --type headless failed:
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole

Details: 00:00:02.963122 Power up failed (vrc=VERR_VMX_MSR_ALL_VMX_DISABLED, rc=E_FAIL (0X80004005))
Looks like something went wrong in step ´Checking status on default´... Press any key to continue...

I have separately installed virtualbox 6.1.1 and restarted my laptop too but nothing works.