Why is my laptop touch screen not working?

Hi. I have a lenovo ideapad s400 touch. I just bought this laptop a few weeks ago and i updated to windows 8.1. Everything was fine, but a few weeks after updating, the touch screen recently stopped working. I was wondering if there's a fix for this issue. I have tried to find drivers on the lenovo website but have failed to find a driver for the touch screen component.
Any help would be greatly appreciated.

Ask Lenovo.

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