Mavericks won't accept my password and I can't authenticate any actions

Following my recent mishap (https://discussions.apple.com/message/25466460#25466460), I successfully reinstalled Mavericks on my MacBook Pro.
Here's the new problem. It won't recognize me as the administrator. I'm the only account in my laptop, and when I try to authenticate any changes in the system preferences, I type my admin account and password, but it won't accept it! The password hint even shows up, but it still won't accept my password!
What really bothers me is that whenever the window opens, the Name: part is empty. Before, my account name is automatically there, and all I need to do is to enter the password! I am super super worried right now, because I don't want to reinstall Mavericks again.
Thanks!
P.S. On a side note, I was not able to oversee the completion of the reinstallation. I was out during the last few hours it was being reinstalled.

more details about my problem:
following the reinstallation, I just wanted to check if the system file I had messed around with (the one mentioned in http://idevicedailys.com/os-x/howto-use-candybar-os-x-mavericks/) was still okay. But this shows up:
I tried using other sudo nano commands like sudo nano /etc/hosts but the same result happens. Please, I am super super desperate!

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