Touchpad not working (ASUS UX31A 13.3-Inch Zenbook)

About a week ago, the touchpad of my Asus UX31a Zenbook suddenly stopped working, I checked FN-F9, nothing happened.

I noticed that the driver "synaptics" disappeard from notification area (it used to be there), but I do not know how to reload it, I restart machine, it does not help.

Anyone has any idea how to fi this? please help

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