You need to turn virtualization on.
- Reboot the notebook.
- Instantly press F10 to enter BIOS settings (or F2 depending on your PC)
- Check the settings and look for Intel Virtualization Technology (Aliases: Intel VT-x).
- Turn it on then save and exit. You could use F10 to save and exit.
This will enable you to use virtualization and enable VirtualBox. Therefore your emulator will hopefully work.