My computer w keeps restarting

Hello,
I really need help!! My computer(Laptop) keeps restarting itself before I even get to the page where I have to type in the password in all. I start the computer and it goes to the motherboard page and my options are Start windows normally or Start windows repair. I chose the repair one and it said It connot repair. So i restarted it and chose start windows normally and it starts up and right before i get to the page where i type my password to log in it shows this thing where it says

123\452689

and the number gets to like 340 and restarting again what the heck is wrong with my computer??