|If you are referring to a laptop touch pad or a touch screen that is part of the machine, you need to get the Windows 10 drivers for it from the system manufacture's web site. If there are not drivers for Windows 10 then you can try Windows 8 drivers or possibly Windows 7 ones. If this was an upgrade to Windows 10 you should have made sure of the drivers before upgrading.|
If the machine has always worked and you did not make any upgrades, try restarting the machine, it fixes many unusual problems. If this does not work you can reinstall the driver for it.
You have to be a little bit crazy to keep you from going insane.