Client issue

Not sure what is going on with my client right now, but for some reason any time i open it up, it takes up so much of the screen that the bottom portion of it is unusable now because it goes under the task bar at the bottom of the computer screen. I can't scroll left and right in the store, I cant access my friends list, and i can't use anything else that is located at the bottom of my client. (The link goes to a post on G+ that has a picture of exactly what i'm talking about here)