To check what are needed to enable it, in the terminal (cmd), entering "systeminfo" command lists requirements. My only need was "Virtualization Enabled in Firmware: No". I searched a little and found a Stackoverflow solution saying starting on MacOS and then go to System Preferences > Startup Disk and restart into Windows operating disk partition and it worked! Then when entering "systeminfo" command "Hyper-v": "Virtualization Enabled in Firmware" turned to "Yes", all others requirements were already yes.