PROBLEM WITH LAPTOP DELL INSPIRON N4050

Hi, good day i have a problem with me laptop

i was making a works with autocad and other programs, in sometime i left the machine on and when come only left a black image, i have to reinstall windows and all programs, but now in unpredictible time the system crash and appear this blue screen

I am trying to repair and defragment the disk but the system crash and how the same screen

This is the image, please tell me if i must format the hard disk or i need make other things 

Thanks for help me