Computer Restarting While Playing

[Commander]

For some strange reason starting today Final Fantasy XIV is causing my computer to restart.

I was puttering around the Hinterlands when the screen went greyish, the music started stuttering and a few seconds later my computer had restarted itself.

After the third time it did this, it also took my graphics card driver with it, and I was forced to reinstall (and update) my driver. The driver has been reinstalled, updated to its latest version, both my monitors are displaying and working again, and the game is still causing the computer to crash and restart.

Any help would be appreciated.