De acordo com este tópico do fórum , deve haver uma chave de registro que você possa alterar:
[HKEY_LOCAL_MACHINE\SOFTWARE\Synaptics\SynTPEnh]
"UseScrollCursor"=dword:00000000
Just add this to registry. Either copy-paste the above text into Notepad, save it as a .reg file and run it, or manually add it using RegEdit (on my system, this value didn't exist, so I had to create it manually). Afterwards, restart SynTPEnh.exe and SynTPHelper.exe (use TaskManager to kill them, then restart them from the Synaptics installation folder, which is usualy C:\Program Files\Synaptics\SynTP). Or simply restart your system.