In this case it is necessary that you contact the computer manufacturer. This is a feature that the processor has from factory but the manufacture of the laptop has the possibility to allow you enable or disable it on the BIOS. Since you said that the option on the BIOS doesn’t seem to exist, the manufacturer didn’t include in there. The only possibility is that the computer manufacture provides you a BIOS update that allows to enable the VT option on BIOS level.