First call Apple and report the problem
they will probably get you to take the machine to your local Apple Store.
Boot your machine and create a new admin account.
log out and then log in using that new account.
Is the screen still displaying the problem?
If yes, then it is not account caused.
Are you in the US? If so, the number you want is 1-800- My Apple (1-800- 692 7753)
let us know how you get on