I don't know why everything became so large. It wasn't like that before. I tried to look in the control panel, but I still can't find the way to make it normal again.
Windows 8, 1024 x 600, Acer netbook
I opened up the Magnifier on my Windows 8 VM, which had the effect that your pictures show - go to your Desktop and see if it is open in the tray, and possibly check the notification area / task manager.
If that doesn't work, open your Charms bar, go to Settings, and under Easy of Access on the left, turn off 'Make everything on your screen bigger'.