Check the box for the Use your finger as an input device option. In the Pen and Touch properties window, click the Touch tab. Once the Control Panel is open, click the Pen and Touch option. Run Windows Update, or download and install the latest drivers for the touch screen, to see if that fixes the problem. You can also check the manufacturer's website to see if there are updated drivers for the touch screen. If it still is not working, it could be defective and needs to be repaired. 
Also, wash your hands to remove any oils, and dry them thoroughly, then try using the touch screen again. If the touch screen is not working, try cleaning the screen to remove any dirt, dust, and fingerprints.
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