Solve : Laptop starts up and logs off itself!?

1.	Solve : Laptop starts up and logs off itself!?
Answer» Hello! I have a problem with my computer!! When I turn it on the LOG in screen for a password comes up, so I type in my password and the sound of windows STARTING up plays, then a BOX comes up and says logging off. So the sound of windows logging off plays and then restarts and everything HAPPENS again. I have been searching everywhere for answers and nothing has been clear. Can anyone HELP?? PLEASE!!What OS is this?Same with safe mode?

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