Little black rectangle

SorryImRomanian

Honorable
Dec 25, 2013
30
0
10,530
So i am getting this little rectangle when i play games and i dont know what kind of problems causes it and what i should do. I should also mention that i get BSOD when i play youtube videos but that is randomly. Here is a screenshot http://imgur.com/kcYBB29 any information is very helpful! Just some more details the box flickers and comes on randomly.