Why can I no longer sign in to my mac air?

I am unable to sign in to my mac air. Have had to use guest.

With Lion or Mountain Lion, restart your computer and hold both the Command and R keys. 
On the menu bar, choose Terminal. 
When Terminal opens there will be a cursor, you type:
resetpassword
And then press Enter. You will then have a window, Reset Password, choose the user ID, and enter the new password in the two fields that appear, leaving the hint field blank.  Click Save.
Warning appears that user's default Keychain password wasn't changed, click OK. 
Now at the lower part of the Reset Password window, click Reset the userID home folder permissions.
Click the apple in the left corner and choose Restart.
You now have the new password you created, write it down. 
You will not lose any material on your system doing this.

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