How to reset windows xp administrator password?

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If you have a bootable CD/USB drive,some password tools can be burn to it and you can boot your computer from USB to run the software,so that you can recover/remove WIndows system password from USB.
Such as Windows Password Rescuer,here I just list the simple steps:
Step 1: Download Windows Password Rescuer
Step 2: Run it to burn to bootable CD/DVD or USB flash drive
Step 3: BIOS setting of your locked computer to boot form CD or USB
Step 4: Reset Windows password on a friendly window after Windows Password Rescuer starts.You also can use Windows Password Rescuer to add a new user with administrator privilege to your Windows when you can not find target user. With this New user account you can logon your locked computer directly to copy important data from the locked computer if you want to reinstall your Windows system at last.

1.Use the built-in administrator account which you can logon without password in safe mode.It was built when you install your system and its password default as blank.Press ctrl alt delete twice in the welcome screen and you can see a classical logon dialog box,type administrator and press Enter.Or you can press F8 when you start/restart your computer to select start from safe mode.2.Use a password reset disk If you have created ever.Of course it must be created for your current password.You can find a prompt when you input a false password in the welcome screen.Clik it and follow the guide.3.If the two methods above cannot help you,you can find a recovery tool.As far as I know, there are many password tools on the network, but I have used is "Windows password rescuer professional 3.0" ,it is simple and safe that the average person will use it. It can soon reset the password in several minutes.Only four steps can help you reset the lost Windows password:Step 1: Download Windows Password Rescuer and install it to another computer.Step 2: Run it and burn it to a bootable CD/DVD or USB flash drive.Before this confirm that you have insert a CD/DVD or USB.Step 3: BIOS setting:Setup your own computer boot from CD or USB.Press F2 or DELETE when you start/restart your PC to get into the BIOS SETUP list.Use arrow keys to select boot manu,and use /- key to move the CD/DVD or USB option to the first site.Then inset the CD/DVD or USB you have just created. Press F10 to save and exit.Step 4: Reset Windows password: Wait for a moment,it will display friendly operate window,and you can reset whichever password on it.More detailed instruction refer to this article:http://www.daossoft.com/documents/how-to-reset-window-2000-xp-vista-win7-password.html

1. Ophcrack and Offline NT Password and Registry EditorThey are the free Windows Password Recovery tools online downloaded.2. Other accounts with administrator rights and privilege or the built-in administrator accountBoot system from Safe mode and login in with the accounts to reset windows password.3. Professional Windows Password Recovery CorporationWith it, you can DIY a password reset disk and get out of problem within minutes!A tutorial can help you much:http://windowspasswordrecovery.net/article/recover-lost-windows-xp-password.html

You need to remove the existing registry data file or replace it with another backup / fresh registry data file.