Then go directly into bios and load the fail safe defaults, while in bios check your temps a voltages and list them here for us to have a look.
Don't forget to save when you exit bios and see if the computer will boot to windows. If it won't reseat the video card and ram and try and boot to windows again.
I do believe this is a hardware problem because it will restart before you can get into safe mode so if you can get us the voltages that is important.
Is this a new build and did it ever run windows without any errors?