Calibrate touch screen in Windows 7:
1. Click Start , Control Panel then Hardware and Sound.
2. Under Tablet PC settings, click the calibrated pen or touch input screen.
3. On the Display tab, under Display Options, click Calibrate, and then allow the program to make modifications.
4. Please follow the on-screen instructions to calibrate the touch screen.
If the problem persists, click Reset Calibration Data in Display Options. This operation will clear all previous calibration data and restore the monitor to default settings.