screen reduced as cursor is moved across the screen

I recently purchased a Toshibal L675 laptop. I have IE explore 8. Sometimes if I move my cursor across the screen, the screen size will reduce. Ando sometimes a very small scroll bar will appear as if it is hijacking the scroll bar I wish to use. How annoying. I can't believe this so called feature was allowed. Anyway, how do I turn it off. It is so annoying. I have to give presentations on my laptop sometimes and it is so annoying.