How can I turn off the touch function on my S2340T monitor?

I am running the S2340T monitor on a Windows 8.1 Pro system.  The touch calibration occasionally goes haywire, but I've always been able to open the Pen and Touch tool and re-calibrate.  Except that now it does not seem to be 'holding.'

Since I rarely use the touch aspect of the monitor and am completely comfortable using my trackball mouse, I would like to just turn the touch aspect *off*.

How can I do this?  I know that you go to Device Manager, but how do I know which "Human Interface" item it is?  I'm a gamer, so I have a *lot* of human interface items.

Thanks!