Open regedit (registry editor) and create a DWORD 32 bit with the name 'HasBothButtonFeature' with value 1 at the location:
HKEY_LOCAL_MACHINE\Software\Synaptics\SynTP\Defaults\
log off and log on and you will be able to emulate the missing third button of touchpad pressing both the other buttons.
Bye
log off and log on and you will be able to emulate the missing third button of touchpad pressing both the other buttons.
Bye