The situation is I'm trying to play Fallout 3, but it keeps creating random visual glitches, like purple checkerboards and grey light tunnels around the characters' faces. I assume this is because It refuses to switch from the integrated Intel HD 4000 graphics to my AMD Radeon HD 7730M. I only really want to get rid of the purple checkerboards.
(refer to image)
The drop down menu for the graphics adapter only has the Intel HD.