Boot trouble?

Users questions: Each machine is just getting out of the dialog box, user name: To enter the administrator can access. Did not previously exist any worries, because even very food only recently ended up this way. . . . Would like to help Thank you!
Experts answer: Start * Run, type controluser passwords2 to "To use the machine, the user must enter a user name and password" before the checkmark on the swap.
  • This information provided by the users.Thanks!