I just re-install windows 8.1 then I've installed Windows8.1-KB2939087-x64, Windows8.1-KB2975061-x64, Windows8.1-KB2919355-x64, Visual C++ Redistributable for Visual Studio 2015 and Google Chrome. At that point everything worked normally except that the monitor identified as #2 in the picture below displayed the full HD (1920x1080) improperly.
To fix that I downloaded the Graphics driver for my APU processor with graphics (AMD Fusion APU A4-5000 Quad-Core with AMD Radeon HD8330 Graphics). That's when the second display went haywire and displayed everything in grayscale (though now 1920x1080 takes the entire screen unlike before)
Here is what I get:
I had to photoshop it to grayscale to show you what it looks like because when I take a snapshot of the desktop (print screen) the picture is in full color.
I've also tried to reset my monitor; nothing changes. Also when I boot to windows 10 the color is back again which means this comes from windows 8.1 somehow.