If you want to enable or disable the inverted colors feature in Windows 8 or 8.1, here’s what you’ll need to do:
First, press WinKey+F to open the search tool and then type in “Magnifier”. Then, select “Magnifier” in the search list (not “install magnifier” or something).
Once Magnifier opens, the screen may, as you might expect, magnify. Ignore this (or hit the minus button until the screen goes back to 100%) and locate the gear icon in the Magnifier window.
Check or uncheck “Turn on color inversion” and click “OK”.
If everything worked, your screen will now be inverted (or back to normal).