Unfortunately, you've given us no information about your computer. Operating system? Age of computer? Make and model? What have you tried to fix the problem?

Have you pressed the "Tab" key to skip to the password line? Do you actually have a password, or is the password line left blank? Tried simply pressing the "Enter" key? Tried accessing the computer using a different user? (It's always best to set up a second user with admin rights just in case the primary username becomes corrupted.)

Hope this helps and let us know more.