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 ...
I created a VM a while ago for testing things in a safe sandbox. It's nothing fancy, just a Win10 installation in VirtualBox. I fired it up the other day for the first time since I upgraded my system, ...