[SOLVED] Mediator says my game directory does not exist

I have been trying to use the mediator with multiple games and it only works with some. Call of Duty Black Ops 1 as well as Dead Space get errors when trying to add them to the mediator saying that the file does not exist. I don't understand why it would work for games like dishonored but not those. I would appreciate some help figuring this out.
Update: Okay so I just uninstalled Black Ops 1 from my F Drive and put it onto my main C Drive and it worked. Is there a way to make the Mediator able to go to a second hard drive?

Never mind I got it fixed. For some reason the folder that my games were in "didn't exist" or so my pc says. I just made a different folder and reinstalled my game and it worked.