I have an NVIDIA GeForce GTX 660 and was playing games for the whole day and around 7pm when I was playing Far Cry 3 my whole computer just turned of instantly, I turned it back on and launched Far Cry 3 again but after about 5 minutes of playing it the game crashed and I got a black screen, and I had to turn of my computer my self. So I turned on my computer again and launched Far Cry 3 again and now it crashed instantly in the main menu giving me a white screen. After turning in the computer again I played another FPS game and at first it crashed giving me a gray screen. After turning on my computer again I launched the same FPS game and I could play it but I would have low frame rate of about 60 FPS, before this moment I would cap out the game at 200 FPS. I did a system restore, but it didn't do anything since when I launched Far Cry 3 it crashed instantly in the main menu. And so I'm asking for help of what I could do to resolve this issue, thank you.