If you notice a touch by your finger or pen on the screen occurs next to the point touched and not at the point of touch, then you may need to either calibrate or reset calibration for the input screen.
You would calibrate
to adjust how accurately your screen senses when you use a pen or finger.
You would reset calibration
back to default if you had calibrated your touch and pen settings, and now say for example the charms
don't appear when you swipe in on the right edge of your screen. It's possible that Windows isn't detecting the edge of your screen accurately because the screen boundary was reset during the calibration.
This tutorial will show you how to calibrate
or reset calibration
of the input screen for pen and touch
in Windows 7
and Windows 8
You must be signed in as an administrator
to be able to do the steps in this tutorial.