Curves black eye dropper turns image white? Auto color turning image white?

I followed a tutorial with curves and the curves eyedroppers that made me go into properties and change some settings. Specifically the black eyedropper settings. Ever since then every time I use the black eyedropper in levels or curves or if I use auto color, auto contrast or auto-tone my whole image will turn white.  Is there a way to reset these options in photoshop?

If I delete photoshop and reinstall will photoshop reset to its original settings?

I'm so frustrated with this. I can't find the tutorial I followed either so as to undo whatever it said I had to do....