Originally Posted by SuperWaffle View Post
Start -> run -> eventvwr.msc -> enter -> Collapse "Window Logs" -> Click on "System" -> find the error entry of when it happened and check if it contains any useful data.
you will have to run windows in safe mode.

But if your pc wont start at all and blue screen it will be a graphics or ram error you need to get a new 1 of what ever is broken.