Try uninstalling the synaptic driver
, reboot. Extract the downloaded synaptic driver to a folder on the hard drive. Now update the driver in device manager by pointing to that folder. You can repeat the exercise with the latest downloaded, extracted drivers
(use the link in post #5 above).
Also check whether the touchpad is turned off- many laptops have a small button at the top of the touchpad to turn it on or off or check in the settings.