My PC keeps turning off...please help

[Tomiangu]

JustinLovesIzzy, sorry, no solution here but wanted to say that I had the same thing about a week after installing FF14. Out of the blue, the computer would kick me right out and restart. I tried the drivers as well, update, uninstall, reinstall etc. Nothing worked for me. Sometimes I could play an entire evening and sometimes it was impossible to play due to the restarts. I have a Geforce GTX 680 by the way.
To this day I am not even sure what fixed it, all I know, there were a couple driver updates through the Nvidia Control Panel and at one point in time it just stopped restarting. Some time back I experienced the same thing when I installed Minecraft. Same card, computer started to act up with restarts even outside of the game. I uninstalled it and it worked fine after that.
So far everything works fine for me, knock on wood.. Hope you figure yours out soon.

[Bargon]

I had a similar problem like yours. PC would shut off only during gaming sessions. Temperature monitoring software showed that nothing was overheating. Power supply (not a cheap one either!) was still under warranty so I replaced it. That didn't help either.

The culprit turned out to be a bad stick of RAM. If you have multiple sticks, take one out. Play the game for a while and see if the problem persists. If it still does, put that one back in and take out the other(s) and repeat. It seems like my problem was a much rarer occurrence than having a Power supply failing, or overheating... but hey, it happened to me.

[Malamasala]

The culprit turned out to be a bad stick of RAM. If you have multiple sticks, take one out.

This is probably my situation. I say probably since it is so random. I replaced by RAM once with new, and the problem seemed to go away. To confirm it really was the RAM I plugged it in together with the new RAM but it worked so it confused me. Later (a couple of months) it began again and I was suspecting the PSU. But just because I could, I removed the old RAM again and there has been no problems since. I can't tell if I'm just in the lucky period, or if it actually is the RAM, but I'm going to see how long this lasts me.

But it is soon time to get a new PC (or most of the inner content anyway) because I've noticed my ethernet plug is broken on the motherboard and it can never be good to have broken stuff on the motherboard and not act on it with replacements.