Projector problem

For my very first post and the reason I sought out this forum... *drumroll*

In my classroom I have a Toshiba projector and a SmartBoard (interactive whiteboard). During instruction I have students sit on the floor inbetween the projector and my SmartBoard. I always have the projector as far back as I possibly can. Ever since I got the projector I had it in a certain spot and I remember having to adjust a setting on the computer to get the screen size small enough to fit the SmartBoard.
The wonderful technology people in my school district reimaged my machine and now I cannot remember what I did and I cannot get the screen to fit unless I move the projector forward.

Does anyone have any idea what I could do? :confused It really bothers me because I know it is possible!