First of all, make sure you have typed in the right username and password when you log in.
The mesage you got said "No account could be found with that username or password."
Which means that you probably have typed the password or username wrong.
The account aragorn_estel has not been deleted. But you have renamed it, so there is no account by that name anymore. But I see we have one Failariel_ancalimon and one Failariel_Ancalimon. You didn't re-register, did you?
If you still have problems, e-mail us at email@example.com with the username and e-mail address you used to register with, and we'll get Grep to take a closer look.