How to reset administrator password in xp?

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If you do not have a reset disk or cannot log on as an administrator, unfortunately, you may have to reinstall Windows OS and all other programs that were installed on the computer before you can use the computer again. This is for security. Without these safeguards, anyone could reset a password to anyone else's computer and gain access to private information.（from Microsoft official info) Because of this, a lot of people think that after having lost their Windows administrator password, they absolutely have to reinstall their OS. Despite of this, now let me tell you something: They are wrong! Here some methods / utilities which can be used to recover Windows password:Method-1NOTE: If you never created any administrator or user accounts, this method may be unuseful, because your current account is the default administrator account.The first thing you check if you forget login password. When we install Windows, it automatically creates an account "Administrator" and sets its password to blank. So if you have forget your user account password then try this:1. Start system and when you see Windows Welcome screen / Login screen, press Ctr Alt Del keys twice and it will show Classic Login box. 2.Type "Administrator" (Without quotes, Note: Do this If you do not know any other administrator user account,) in Username box and leave Password box field blank. Now press Enter and you should be able to log in Windows. 3. Now you can reset your account password from "Control Panel -> User Accounts". 4. Pick an account you want to change. 5. Select Change the password or you can remove the password. 6. Type the appropriate information and click Change Password. Same thing can be done using Safe Mode. In Safe Mode Windows will show this in-built Administrator account in Login screen.Method-2Use windows password reset disk to reset your lost password, before this you have to create a password reset disk in CD or USB Flash Drive. More details please refer to: [url=http://www.daossoft.com/blog/xp-password-reset-disk.html]How to create Windows password reset disk and reset your lost administrator password[/url].Method-3Delete SAM files In Windows NT / 2000 / XP, system uses SAM(Security Account Manager) to manage the safety of user account.SAM uses Security Identifier to perform Account management. The Security Identifier was create with the user account, and once you delete the user account, the SID also be deleted at the same time. One SID with only one account even if the same user name created in different time will with different SID. Therefore, once an account is reconstructed, it will be given a different SID, and won't keep the original jurisdiction. SAM perform with %System Root % system32configsam file. This file is a Windows NT / 2000 / XP user account database, all user name and password and related information can be stored in this file.Now a solution appears: We can delete SAM file, then start system, it will rebuild a clean SAM file with no password inside.However,even if you delete the SAM, some systems will start to go wrong.Method-4If you cannot access system as administrator or have not created a password reset disk, you can use the third method. But this method is complicated that you have to boot DOS and it will make the system in risk.Is there another simple and efficient solution to recover the password?Answer is affirmative. Recently there are lots of windows password recovery tools on the network, but it is not every tool can solve the problem quickly. I know one of the most popular tools is [b]Windows Password Rescuer[/b]. This program can reset the password within several minutes, and the operation is simple. It can reset password of all Windows versions, such as Windows 7,Windows XP, Windows server 2008/2003/2000 and Windows vista etc. You only need a blank CD or USB Flash Drive to complete the task. If you want to know how to use Window Password Rescuer,you can see this article: [url=http://www.daossoft.com/how-to-use.html]How to use Windows Password Rescuer[/url].

You can log on as administrator on safe mode.Press F8 when you start the computer and choose Safe Mode to get in.If you can not log in safe mode, try the tool bellow,it is the best method without lose anything.

In consideration of remaining all programs and data of the computer,I recomend you to use a passowrd tool:Windows Password Rescuer.It supports all versions of windows operation system.Recover Windows password without lose anything.Here are the simple guide:
Step 1: Download Windows Password Rescuer Personal and install it in any available computer
Step 2: Burn a bootable CD/DVD or USB flash drive
Step 3: BIOS settings of your locked computer to make it boot from CD/DVD or USB flash drive
Step 4: Reset Windows password successfully.
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.
http://www.daossoft.com/documents/quick-start-guide-for-using-windows-password-rescuer.html

1. Try No Password Administrator Login Backdoor- In Windows XP there is built in administrator user account that has administrator credentials, enabled by default and without any password to protect the account from been access. If you didn’t change the administrator’s password, then try to sign in to Windows XP without password. 2. Reset password from another user account with administrator credentials.If you are unable to find your lost password from the above listed methods then you need opt for the windows password reset tools. When I had met such situation, I adopted recommendation of Windows Password Recovery Basic tool online. It solved my problem within 5 minutes. I was so appreciated for it!Hope this help you!

After you log on as an administrator to a computer that is not a member of a domain, when you double-click User Accounts in Control Panel to change the password for the built-in Administrator account, the Administrator account may not appear in the list of user accounts. Consequently, you cannot change its password.This behavior can occur because the Administrator account logon option appears only in Safe mode if more than one account is created on the system. The Administrator account is available in Normal mode only if there are no other accounts on the system. To work around this behavior:- If you are running Windows XP Home Edition, restart the computer and then use a power user account to log on to the computer in Safe mode.- If you are running Windows XP Professional, reset the password in the Local Users and Groups snap-in in Microsoft Management Console (MMC):1. Click Start, and then click Run.2. In the Open box, type "mmc" (without the quotation marks), and then click OK to start MMC.3. Start the Local Users and Groups snap-in.4. Under Console Root, expand "Local Users and Groups", and then click Users.5. In the right pane, right-click Administrator, and then click Set Password.6. Click Proceed in the message box that appears.7. Type and confirm the new password in the appropriate boxes, and then click OK.