The Magnifier, in Windows Vista and 7, zooms in on a part of the screen to make it bigger. But you dont necessarily need it starting when windows starts. To prevent it from starting when windows starts:
Open the Control Panel. (Start>Control Panel).Click on “Ease of Access”.Under “Ease of Access Center”, click on “Optimize Visual Display”.Make sure that the box next to “Turn on Magnifier” is unchecked.Click “Save”.The magnifier should no longer automatically run at startup.
Widows Vista was similar, but a little different.