I need to "reboot" my iMac. Cant log in, profile account file(s) problably missing

Question

I was deleting some applications etc. on my iMac when the screen suddenly toned down
and a message said that i had to restart the computer (by holding the power-button).
After that I cant log onto my account. This message pops up;
"You are unable to log in to the FileVault user account "daniel" at this time.
Logging in to the account failed because an error occurred"
So I guess that I must have managed to delete some file that belonged to the "daniel profile".
This is mainly a problem since this is the only account on the computer with no Guest-
account activated either. Since their is no option to create a new account at the start-up
dashboard... well.. you see my problem.
So what I have done so far is to try a Safe Boot. The support page here on this site said
that this will include a automatic disc check and repair.. However Im not sure if that
worked at all because i still had to (try) to log onto the Daniel profile which didnt work.
And no difference was made after restarting again.
I have no Mac OS X Install Disc avaliable at the moment, hopefully its still around somewhere.
Since i didnt live where I live now when i got the iMac its problably in my former home
(parents).. Not an option right at this very moment.
So instead i am now moving on to the Single User Mode and Fsck. I write the
whole /sbin/fsck -fy and i do get a FILE SYSTEM WAS MODIFIED message (one time),
even goes for some more rounds just in case.
I reboot but the problem is still there.
So instead i tried to create another user through the Fsck with
rm /var/db/.AppleSetupDone
Which take me to the initial set-up screen however i can now not pass the
screen where you choose language (i click a language and the screen goes black
for a sec and then it turns back to the language screen again)
So i do "rm /var/db/.applesetupdone" and is now back to where i started..
Im thinking that maybe deleting the user ("rm - R /users/username") would
be something that might work.. but then again i dont know..
Also im starting to think that some of the problem is in that i changed the account username
it says "Namn" at the login screen but as i wrote "Namn" cant be find in the system,
but the old one "(Daniel") does.
... Any ideas? Is there anything I can do? Will the CD work? If i dont find the CD can i get another one?
Does your average computer store has knowledge about things like these?

Answer 1

Apple Store should be able to help, I doubt just any computer store will know how.
Tough without the Install disc, but some things to try...
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
If account was renamed that won't be good at all.
Do you have a Backup?