Well, when you start up your PC the driver is not even loaded yet, so it still can be the driver. According to the GeForce website, the latest driver is 368.81 . You may have a memory issue on your video card as far as I can tell from what info you provided.
Try to uninstall the driver and remove the card from the device manager (delete the driver if asked). Have the latest driver available and restart the PC, letting Windows recognize the "new hardware". If that does not help, could you provide a screen shot if possible?? Just take a picture with your phone and attach that to your next answer.
Thank you.