You need DS3 tool to get the controller to work on a PC. as far as I know there were no pc drivers for the controller, at least when I was looking it up and using it. however, I now use a PS4 controller.

Anyway, I had the issue of random disconnects with it. I would have to restart the ds3 tools, and then restart ffxiv to get it to work again. since I switched to ps4 controller I used http://ds4windows.com/ and so far it has been flawless. just plug it in and go everytime.