Thanks for the update and glad to hear that you have things under control.
That particular symptom might indicate you need to refine your ram settings (timings) and set the proper voltage. It seems, sometimes, when you populate all available ram slots with 1333Mhz (667) or higher/faster you need to compensate for the extra demand on the controller by adjusting the voltage incrementally until you reach a stable condition.
So if you want to experiment and resume using all four sticks to get back to 16 Gigs of ram you may want to start with manual settings of 9, 9, 9, 24, and a command rate of 2T and start with your memory voltage at 1.5
If blue screens persist then, depending on your options, incrementally increase the voltage to 1.54, 1.56, 1.58, etc., I believe I finally stabilized at 1.6 with my particular hardware. Of course yours might be slightly different.
I had a similar problem that I wrote about here
http://windows7forums.com/blogs/trouble/436-my-bsod-odyssey.html which I immediately resolved by dumbing down the memory to 1066 Mhz (533), 7, 7, 7, 20, 2T, 1.5v. I have subsequently, through trial and error, found that everything runs fine at 9, 9, 9, 24, 2T 1.6v.
Good luck.
Randy