Quote Originally Posted by Deathray View Post
Now, I've never really had a problem playing video games on my pc, it's fairly new, and up until this point has been able to handle almost everything it plays on the highest graphic setting. NOW, the issue i'm having is that I can barely play ffxiv even on the lowest settings, without lagging. This only seems to happen more profoundly on fullscreen mode, when in windowed i can get away with playing on high-ish settings.

Anyone have a clue as to why this may be happening?
I really want to playyy xD
Your problem is the graphics card, the GT 320 is below the minimum requirements.

As has been suggested, when you are running in windowed mode, you are most likely also running at a smaller resolution than your monitor, thus lessening the work the card have to do per frame.