Projector Dimensions 100 My Computer Projector Monitor Moves The Image To The Right Exactly One HALF Of The Screen With?

My computer projector monitor moves the Image to the right exactly one HALF of the screen with? - projector dimensions 100

Single dose of time
Model is a projector PJ458D View Sonic
The computer is a Dell Dimension 2400 running Microsoft Windows XP Service Pack 1 or 2 at most 2
I show in my Intelliboard for my math class