Acer Aspire V3 571 :: How To Deactivate Two Finger Tap On ELAN Touchpads

I have been trying to find out how to deactivate the two-finger tap right click function of my ELAN-touchpad (on my Aspire V3-571, Windows 8.1), as it frequently bothers me when writing. The touchpad is located so that part of my left hand rests on it when writing. When I then try to use it with my right hand I often zoom [now deactivated] or open the context menu. I also sometimes randomly jump to a different part of the text, continuing my writing there.
 
I found several tutorials explaining how to activate the two finger tap, but none of the given solutions worked for deactivating it again.
 
What I've tried:
 
1. Going to the ELAN-options and deactivating it under "multiple-finger gestures".
The problem is that there is no field for two-finger tapping for me. I have "zooming", "scrolling", "turning", "Three-finger-Tap", and "swiping with tree fingers" [all translated from german, so they might not be exactly called that in english].
What more wonders me is that under "one finger gestures" there is the "tap" option. And beneath the tick-box to de/-activate it it says "One Finger: click/choose"; but it does not say "two fingers" for example.
 
2. Changing it via regedit
I've found sites suggesting manually changing something in the registry. However the frequently given locations of the registry does not seem to apply to my machine, so I cannot find the keys I need to change.