EDIT: Nevermind. I've managed to fix the problem.
A long while back, I had tried downloading a mod to the game; but after playing around with it, I was ultimately unsatisfied with the mod. I've tried removing the mod from the game, but couldn't remove the mod entirely. So, as a last resort, I'd like to try and uninstall the game. Unfortunately, I'm unable to remove the game from my computer.