My computer had a blue screening problem whenever I would start up a game or youtube video within five minutes of starting my computer up. This time it happened to freeze which it has never done before and I had to flip off the power supply to turn it off and now when It boots I can't do anything, it takes forever to load any of my start up programs, my mouse is just the loading circle thing and windows explorer stops responding. It has the same effect when I boot into safe mode. I have a GTX 670 and an i5 3570k, I did a RAM diagnostic and it said no problems were found. Does anybody know what the issue is here?

I did not overclock anything.