You can also reinstall driver using VAIO Care software if the shipped operating system is used. Click on the start menu, type: VAIO Care in the search box and press enter key.
In VAIO Care window, click Recovery & Restore. Click Install Applications and Drivers. Select Programs or Drivers to reinstall and click next. Follow on-screen instructions to complete the installation process for each application and driver selected.
I have also provided the link to calibrate the touchscreen.