Update your graphics card drivers here.
Your CPU and graphics card are not supported.
Is it bluescreening? Down the bottom left it should name what file is causing the crash. Post that back here.
Try disabling 'Automatic restart on system failure'. This would stop the computer automatically rebooting when a BSOD occurs.
Try doing a search. I think people have had this problem before and solved it.
Try turning on sticky keys maybe. Press shift 5 times and then see if that helps.
Separate names with a comma.