Well I to like so many others ran into hard times with FFxiv, My problem was everytime i pressed "start game" it would start to load then i would get a directX error popping up , soon after the game would crash.
I tryed everything i mean everyhting, Driver update, Windows update, about 20 different resolutions, and switched from VGA to HDMI. I even tryed to disable the event error 4101, my problem is my video card times out and resets itself error 4101.
after going into the regestry and discovering it doesnt help, I tryed the last thing i could short of reinstalling (witch i did anyways before this dont know why I didnt include it up top and it would be easer to just erase and add it but ill do it the hard way)
My Video card is a Ati Readion 5770
I turned my GPU down to 850 mhz and the memory to 1200 MHZ started the game and it ran perfectly.
So all of you out there with the 5770 or 5 series i would defenetly try to DownClock to 850/1200 it works for me!