There are so many answers to this question.
Here, I will recommend you two common and universal password recovery tools,
Ophcrack and Windows Password Genius.
Ophcrack
is a free Windows password cracker based on rainbow tables. It is a very
efficient implementation of rainbow tables done by the inventors of the method.
It comes with a Graphical User Interface and runs on multiple platforms.
Tips: The latest version of Ophcrack still
couldn't recover Windows 8 password. If your HP computer is installed with
Windows 7, you can consider taking this software into use.
Windows Password
Genius is a powerful password recovery tool applied to Windows 8/7/Vista/XP
and Windows server 2000/2003/2008/2012. Besides reset HP Windows 8 password, it
also could add a new user for Windows 8 logon.
The above two password recovery tools suitable for different situations.
According to the status of your HP computer, choose appropriate software to
reset forgotten Windows 8 password for HP desktop or laptop.
Source from:
http://isunshare.blogspot.com/2013/08/forgot-hp-windows-8-admin-password.html
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