Hello everyone

Okay, so I recently upgraded from a AMD 7800 series card to a EVGA GTX 970 card yesterday. I got my friend to install it and stuff, since I'm really not good at the technical side of building/tweaking a computer. So, he installed it and all was good until this morning when I woke up. I was playing FFXIV in full screen when it suddenly went black, and the PC suddenly restarted itself. The screen itself was still black until I forcefully restarted it by holding down the power button. Afterwards I tried the game again, and 10 minutes later it did the exact same thing. Both times I've had the same 'Windows has recovered from an unexpected shutdown" and says it was a BlueScreen, Locale ID: 2057. If anyone's able to help me I'd really appreciate it - the game's running beautifully and I'd like to play :P ... Other stuff I've tried are: changing the settings, rolling back to older Nvidia drivers, and using CCleaner to clean the registry, but I've still yet to correct the problem.