If Virtualization keeps turning off when your system reboots, you need first to check if VT-d, or VT-x is enabled on your BIOS. If they are not enabled, do it and then turn on Virtualization. If doing ...
Restart the computer, and while it is starting back up, press the BIOS key (this is usually one of the F2, F10, F12, or Delete keys). Once in the BIOS, look for options like Intel VT-x, AMD-V, or ...