Windows on a MacBook

As a demonstration to a friend with an HP laptop and windows 10 I turned off the trackpad in my windows 10 (the BootCamp version) on my MacBook. How do I turn it back on.? When I select windows using the option key on restart of my MacBook I get no pointer and have no way to control it anyway. Are there steps I can take to restore the trackpad in my Windows OS on the MacBook using keystrokes?