You may have virtualization disabled on the host computer. To enable:
- Go to your host computer's BIOS (during reboot, press F12, or Delete, or F2, ... depends on computer).
- Find some options regarding virtualization. E.g. recent Lenovo's have it under Security / Virtualization.
- Enable what's there to enable. E.g.
VT-d technology [Enable]
.
This made it work for me.