1.On the Desktop, right-click the Windows button and select Control Panel.
2.At the top-right, set View by to Large icons or Small icons.
3.Select Tablet PC Settings.
4.In the Display options section, Display should be set to “1. PAR 15.6inch”.
5.Press Calibrate.
6.Follow the directions on-screen, and tap the crosshair as instructed.7.After the calibration is done, test the touchscreen by closing the Tablet PC Settings and Control Panel windows with your finger.
7. Restart the Computer
If all the above steps do not work. contact Zak fro escalation.