how can i fix this blue screen of dead :( please help

ok, so i got this BSOD for like half a year, the way that i can get pass throgh it, is to push the start button on the computer for like 15 seconds so it will start up and then get into sleep mode, and then i need to do it like 5-6 times for the computer to get pass throgh it,
i have alot of very importent stuff on my computer and im afraid of losing them 🙁

here i upload a picture of the computer screen
[URL=http://www.siz.co.il/][IMG]http://up389.siz.co.il/up3/jt2hyw0mifma.jpg[/IMG][/URL]

how can i fix this problem?, im really afraid for my stuff on the pc.

p.s sorry for the bad english..