Here is a recent post from the Microsoft Windows Site for Windows 8:
To adjust how accurately your screen senses when you use a pen or finger:

Swipe in from the right edge of the screen, and then tap Search.

(If you’re using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search.)

Enter calibrate in the search box, tap or click Settings, and then tap or click Calibrate the screen for pen or touch input to open Tablet PC Settings.

Check that the monitor shown in the Display field matches the screen you want to calibrate.

Tap or click Calibrate, and then follow the on-screen instructions.

Tablet PC Settings Screenshot

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