So, I have been trying to play minecraft. I was playing "the big dig" and for reasons that I don't now of, it keeps crashing my computer.

It only says that my PC has encountered a problem and has to restart. It never tells me an error code or anything. It was also being very laggy when I was playing yogscast complete. So i don't now. -_- I wanted to play with the mystcraft mod in those but I can't because my game just won't work like it is supposed too. It just started yesterday too. No other game is giving me problems. I just don't know what to do. Oh well . . .