Lost a user account

Hi
I have already posted this problem but I haven't found a solution yet. The problem is that I have made 4 accounts (my wife, our daughters and me) with myself as admins. Now one account is gone. That is there is no option to log in on that account when we start the computer and when I log in as my self (and admins), I can't open the systemmeny for accounts - nothing happens. The window remains grey. So at the moment I cant add, change or delete any useraccounts.
What should I do?
Carl Michael

Log into your admin account, System Preferences->Accounts, and ensure that account exists.

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