<off topic>
^ Control-plus and control-minus. Try that. (Win7.)
I also accidentally found a widget or whatever you call it which sits at the bottom of my screen and allows you to select from 50% to 400%, and "Custom." Darned if I know where it came from, but I use that frequently to adjust between easy reading and shrinking big pics without using the keyboard.
The trouble is the way they set up the Win7 Control Panel it's almost impossible to find stuff like that without knowing in advance where it is and what "they" call it.
</off topic>
Terry