If you are able to boot into safe mode then I'm guessing it is either a faulty device driver since not all drivers load in safe mode.
List of drivers and devices that start in Safe Mode: http://windows.microsoft.com/en-us/windows/which-driver...
Do you have any external devices connected when you boot (with the exception of the keyboard, mouse and monitor)?
smorizio ''and under ai tuner the mb dram speed set to xmp. with 4 dimms you may have to bump the dram voltage'' how do i do that on the asus motherboard and what voltage? and my corsair vengeance is 1600 mhz each stick but it only shows around 668.7mhz on cpu-z, is it suppsed to be around 1600mhz? or 668.7 how do I make it 1600mhz?