Blue Screen everytime Windwos start

#1
well, today I woke up and turned on my PC to find out that no matter what I do my computer get to the "loading windows" state which right after it w7 should appear but instead it shows me a black screen for a couple of second and then goes right into blue screen of death. I tried any repair tool in my windows DVD but none of them change the outcome. ;;

if anyone here could help me at least to get an option to back-up all of my files to my USB hard-drive(or completely repair it) I will be grateful to him for the rest of my life.
 


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