great pc fps?

g@l1hTry Doom 3 for a Zombie and monster shooting.

Doom 3 is CREEPY especially on high frame rates.

Hey you can try the S.T.A.L.K.E.R games. Its very much like Fallout but a lot more FPS oriented and its more like a survival game even though its open world. You can also try the RE4 port for PC though the control scheme is awful. Not a FPS I know but its a good game and I think there are some mods that fix the controls. Serious Sam is pretty fun as well if all you want is pure shooting with a lot of weapons.

Border Lands was sick.

If you are new to FPS try Left For Noob 1&2.If you are feeling hardcore try Counter Strike Source.