Potential shader issues...

I've searched for any fixes for this but I've had no luck. So I'm going to try here for the slim chance someone might help.
The game runs fine, but for some reason, the shader option in the options menu is blank every time I run the game.
Also, I need to set the shaders to low so I don't get this weird blocky/splotchy darkening/lightening effect on vehicles and characters. Yet, when I play a campaign, and advance to the next stage, all characters, vehicles, and most buildings turn completely black, and changing any graphical settings doesn't help.
I've verified the game's integrity several times, and my graphics drivers are up to date.