How do you reinstall Windows on a pavilion Windows 8 laptop computer if it's stuck on the inter admin password or Windows on password if you don't know the passwords

If you want to reset the BIOS password remove the computers battery and then open the backpanel and remove the bios battery for about 20sec. If you want to reset Windows admin password this is harder issue -> easy way make a backup and reinstall windows and then restore the backup.

If you forgot the password of system, the official answer is NO, there is no way to get the password back. However, if you have other user account who has Administrator right, such as Domain Admin account if the computer joins domain, you may try to use this user account to login to the computer and then reset the local administrator password. If no, you have to reinstall the system.

By the way, you can unplug the hard disk and then connect it to another computer to back up your data in C: drive, reinstallation will not affect the data in other drive if you don't format them.

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

Don't worry when you lost windows xp admin passwords. I realize a simple way to recover windows os password, it need no computer skills and no reinstalling windows. Search Windows Password Seeker or Tech Support
you can burn it onto a USB. Hope it helps you. Enjoy!

okay that's easy man
start windows run in command prompt
then type this net user admin admin /add
first admin is will be your new username and the other one will be your password
then make your username become administrator local by typing net localgroup administrators admin /add
restart system then login with your new username
have a try..
don forget to rate me... :)

Andy, Getting over a lost password has only one solution. And that is to reinstall the Windows again. What you wanted to protect, you will be destroying yourself. It is the biggest crime in the computing and communications world. So, please reinstall the Vista. I know no one like to hear such verdicts but sometimes you have to severe a limb to save the body from cancer.

When I forgot my Dell laptop Windows 8 admin password, I got Windows Password Recovery Tool Ultimate to support me make a password reset disk with USB and reset password efficiently!

You can reset the password with windows password buster.
See: How to Reset HP Laptop Password?

Have your HP laptop login password forgotten? Do you have another administrator? Have you created Windows password reset disk on your HP computer when it is available? Or whether you have installation CD?

If you have administrator, just change HP login account to this administrator and access HP computer with it. At this time, no matter which account, you can easily change or remove its password on Control Panel.

If you have password reset disk, on Windows login screen after you type incorrect password, there will be a message "Reset Password" prompting you to reset forgotten Windows password with reset disk. Just follow password reset wizard to do.

If you have installation CD, it will help you to restore HP computer or repair computer. But it is still dangerous for us to use it because it will delete some important data on your computer.
In consideration of data safe on computer, Windows Password Genius provides a safe Windows password reset environment WinPE. With it and in such password recovery environment, you will don't need to worry about data lost or damaged.

This is a video showing how to use it.
http://www.youtube.com/watch?v=quxuEqpG6f4&feature=youtu.be