I have a Samsung Ativ 7 and the only way I was able to disable inverted scrolling was to go to: C:\Program Files\Elantech and open up "ETDSimpleUI.exe". (If you try to change trackpad setting via Control Panel, another application in the folder named "ETDSimpleUI_win8.exe" will launch by default, and it has very limited options.)
After opening "ETDSimpleUI.exe", there will be the option "Reverse" under "Scroll": deselect it.
Hope this helps someone out there.