What's the driver called?
If you use the Device Manager method you don't need to know the driver. The Properties dialog will show you a Disable button. Have you found a device which does multi-touch?
In case it helps you get a clue for us try this WMI query (e.g. in an Administrator Command Prompt):
C:>wmic.exe Path Win32_PnPEntity where (Description like "%touch%") get Description
In fact, if you find a likely one that way you could change your pattern to match just it and then list all its properties with (for example)
C:>wmic.exe Path Win32_PnPEntity where (Description like "%multitouch%") get /format:list
E.g. in my case MultiTouch is a sufficient pattern to uniquely match one device.
FYI
Robert