I just got a 17 inch screen, so I don't have this problem anymore.
Your issue is your toribash resolution is either to high, or to small.
Hit Ctrl + Enter to enable full screen mode, and it should fix your problem.
If that doesn't, then simply change the resolution to match your desktop.
If that still doesn't work, go below your desktop resolution/higher.
If none of this works, go throw your computer off a cliff, drive a car off the cliff, and land on it. Then, pick it up, piss on it, then light it on fire.
If that doesn't work, your computer won't work.
Good luck!