You could buy a 750ti, and that would help, but you would still get bottlenecked by your processor, and ram. Add 2 more gb of ram. I was in the same boat 2 months back. I had a prebuilt lenovo that wouldn't allow me to upgrade my processor. It had 6gb of ddr3 ram. I bought a 750ti OC, and that helped quite a bit with the graphics, but the processor still affected my max framerate. I went from running SWTOR at medium settings 45-60 fps to running it on max with 30-45 fps average. Before the GPU upgrade it would play max at about 15-20 fps average. I wasn't able to play FF14 at all. With the new GPU I was able to play it on standard settings, but the CPU wasn't enough to keep up with it. I could play the game, but it would use 100% of my CPU in crowded areas like cities.
I upgraded to a new pc and put 8 gb of ddr3 ram, and an i5 4690k processor. put my 750ti in that and I'm able to play swtor on max settings with 60fps. no dips. I can play ff14 on almost max settings at 50-60fps.
So it's up to you. You won't be able to play newer games unless you upgrade that processor. the 750ti OC is a great card though once you have a good processor, and will play any game out on medium or better settings with 60fps, with a few exceptions.