Please remove old touchpad driver, and use Windows Update to update/install the latest touchpad driver.
Here is how to find the settings.
Windows control panel:
1. Right click on Windows "Start" logo, click on "Control Panel" => Programs => Uninstall a program, remove Pointing Device Driver or any touchpad driver.

2. Windows Update:
Click on Windows "Start" logo, click "Settings" => Windows Update => Check for updates.