Whonix doesn't start

I tried to start Whonix on Oracle VM Virtualbox manager but it doesn’t. It’s my first time with Whonix. I have the last versions of both programs.

I give that error every time.
The native API dll was not found (C:\Windows\system32\WinHvPlatform.dll) (VERR_NEM_NOT_AVAILABLE).

    VT-x is not available (VERR_VMX_NO_VMX).

Please enable VT-x / virtualization in BIOS.

I tried but after pressing F2 in Acer see only informations about device, I can change date, time and 4 options check as enabled/disabled. Another way to use Whonix?

VBox has a non-VTx mode I believe. Disable VTx in settings then try again.