My computer had Windows 8 and everything was fine. After installed Windows 8.1, it screwed up my graphics card settings on my PC and I'm having graphical glitches with some of my programs. I did not have such problems when I had Windows 8. I was told, I have to reset my graphics card settings to the defaults that come with original Windows 8. In other words, I have to set the graphics card to what it was on Windows 8, and all graphics glitches would disappear. However, I'm such a "noob" and I'm entriely clueless how to perform this operation. I want a step-by-step guide from a professional.