Hi,
Download and install from support page for this model:
Synaptics TouchPad driver here
If this will not solve your problem then go to:
Control Panel -> Mouse
Click there ' Device Settings ' tab. Choose ' Synaptics TouchPad ' and little lower click on 'Settings... '. From the list which will be there select 'Virtual rewind ' and check two options: vertical and horizontal scrolling. Click 'Ok '.
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