How can I recover a lost password for an administrater password and unlock to make changes in system settings?

I forgot my administrator password and I can't change any setting's in accounts because I locked it. Is there any way to recover the administrator password? I don't care what happens I just need to recover the admin's password.

pjfviegas wrote:
I got an iMac for my sister but she does not remember the password of system administrator (she did not sent me the installation disk) and now I can not install programs or updates
Can you help me ?
Contact Apple for a replacement disc (you will need to give them the serial # of the iMac)

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http://support.apple.com/kb/HT5622?viewlocale=en_US
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Change Password
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How can I recover a lost password for an administrater password and unlock to make changes in system settings?

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