Enable processor virtualization (Intel VT-X / AMD-V) in the BIOS

3. BIOS UEFI Asus (color : grey, yellow and white)

At computer boot, press many times on the DEL key of your keyboard to enter into the BIOS.
If you have an interface like this, click on "Advanced Mode (F7)".

Then, go to "Advanced -> CPU Configuration".

In the informations displayed in gray, you will see the line "Intel VT-x Technology : Supported".
This means that processor virtualization (Intel VT-x) is supported by your BIOS.

Then, scroll down and enable the "Intel Virtualization Technology" option.

Finally, go to the "Exit" tab and click "Save Changes & Reset".

The BIOS tells you what changes will be made.
Click OK and your computer will reboot automatically with the new settings.