Unable to detect DirectX device

[Grit]

"Display Driver NVIDIA Windows Mode Driver, Version 196. 91 stopped responding and has successfully recovered."

That driver is way out of date, so can I take your word for it that you actually have the most recent drivers? And that you ran driversweeper? This is the driver package that you want:

http://www.nvidia.com/object/win7-wi...ql-driver.html

In any case, this isn't an abnormal issue.. and a driver crash usually has nothing to do with overheating in my experience. But the fact that FFXIV stresses your GPU to the MAX is a fact that is important to remember. You would probably find that a new card solves your problem.