Dimming problem in windows 8.1

Since I can not find ANY thread online helping this problem, I decided to make one myself.

What is happening, is when I am watching movies/shows, the screen automatically dims or brightens due to what the lighting it like in the movie/show. It is really frustrating and annoying and I can't deal with it any longer. 

I have a Intel(R) Core i7-4790 CPU @ 3.60GHz Processor
I currently have my moniter setup to my Nvidia GeForce GTX 970 Graphics Card
I have 8.00GB of ram

I am saying now, I only got this computer (it IS a DESKTOP) about a month ago, ALL DRVIERS are up to date, so don't bother suggesting this.

I have also gone into Power Options > Change Plan Settings > Change advanced plan settings > Display > Enable adaptive brightness > Setting : Off - and yet that STILL didn't work. So please don't suggest that either.

I searched in PC settings for the 'Adjust Brightness automatically' and I couldn't find it, when others have it RIGHT THERE. 
I opened the Windows side panel > Settings > Change PC settings > PC and Devices > Power and sleep - and the brightness setting is NOT THERE. It is only the 'Screen' (When plugged in, turn PC off after...) option and the 'Sleep' (When plugged in, PC goes to sleep after...) which wont help my problem.


I don't know whether you people here could help me, but if you could, that would be MUCH appreciated. 

Thankyou.