Bluescreen with haswell

i went to take a shower, and when i came back to my room, i had a bluescreen. i didnt manage to read what it said before it went away and turned my computer off. i launched the windows 7 reset thingy that automaticaly popped up, and it was all good. im wondering if it is the idle mode on my 4670k that did this. i got a haswell certified psu, evga  nex 650g. and i havent overclocked my chip. is it bad if it continues?

If it was only once, there probably isn't anything to worry about.

it's more likely a drver or software bug, or corrupted os files...

i didnt pirate the os. what software do you mean?