8gb ram (gskill sniper edition)
win8 64 bit
gpu: hd 7770 ghz edition
psu: anteq v450
ok get hw monitor,and check your temps.
at high temps computers tend to turn themselfs off to protect the components.
also,try running kombustor (by MSI) and check for the stability of your 7770
also run the CPU test on kombustor tu check your CPUs stability.
if all these things dont show any "error" or problems it might be something else.
be sure your drivers are updated to the latest state and please for the love of god get: http://download.cnet.com/BlueScreenV...-10965136.html
or any other bluescreenviewer to see the reason why you got a BSOD.