Dead Island
Amnesia: The Dark Descent!
(Not a FPS, but good)
I need a game that's under 5 GB.
If it doesn't work on your computer's specs, then you can try this cloud gaming suite called OnLive.
That's how I play it, but unfortunately you have to buy it.
There is a free trial but don't play it b/c you won't get to any scary parts (it only lets you play the beginning of the game for 30minutes)
Dark Descent works.
Thanks to whoever recommended this for me. Good game so far.