You can check if the touchpad is deactivated. To do that, you can press the right combination of keys from your keyboard (usually the FN key and F12). Also, you can start the Sony Notebook Utility (if you don't have it installed you can download it from the following official website). Go to Touchpad tab and make sure that the Disable touchpad option isn't active. If none of this isn't working, try reinstalling the touchpad driver. You can find it of the following support website.
