Verified answer

There are many things that can cause this and without more info the best I can suggest is try to load into safe mode at start up by hitting F8 as it reboots. Whatever the cause it may not be an easy fix and might need a rebuild of your O/S so I hope you have backed your data up.

when you turn on your computer there should be some instructions on how to get into your bios motherboard features while your computer is booting but note it will only appear on the screen for 3 sec's max most the time its F8 or Esc key.after your found the menu you will have a list of options find hard drive diagnostic/memory hard drive diagnostic and do both test?it could be a failed hard drive or your memory "ram" went bad.or corrupt windows files.

To really solve the problem, you have to add what the blue screen says (usually something like WORD_WORD_WORD_WORD. It's at the top of the blue screen. Google that, and then see how to solve the problem.