Extended-function mouse drivers can conflict with Elo touchscreen drivers. 

• Check  this registry path.
• If MouseWare was not in the registry path:
  • Check Control Panel, Add/Remove Programs.
    • If any mouse drivers other than MonitorMouse are  in the list, try removing them.
      • Reboot and check touch operation.
• If neither of the above, or if the touchscreen still doesn't work, check the hardware:
  • For serial touchmonitors that are connected to a COM port, run comdump.
  • If you are absolutely certain that your hardware works, go on to driver checks.