China DOS Union

Accidentally forgot the administrator password for Windows XP when booting, and can't get in. There's only this one administrator user. What should I do? Please give some advice.

Reinstalling the system

Run COPY C:\WINDOWS\REPAIR\SAM. C:\WINDOWS\SYSTEM32\CONFIG under DOS

No need to reinstall the system.

Use Passware Kit Enterprise v7.7

Download: http://www.piaodown.com/down/soft/9280.htm


If the method on floor 3 is feasible, it will be very great!

[ Last edited by martin325 on 2006-5-28 at 17:27 ]

### 1. Description of Incorrect Solutions

When you forget the administrator password while using Windows XP, what should you do? There is a popular method on the Internet: Use a DOS boot disk (if the partition where Windows XP is located is an NTFS partition, a DOS boot disk that supports NTFS is needed) to enter real-mode DOS, and delete a file named sam in the %SystemRoot%system32config directory. Restart the system, the login password of Administrator is empty, and we can easily log in to the system.

**Small Knowledge**: In Windows NT/2000/XP, the management of user accounts adopts the mechanism of the Security Account Manager (SAM). This mechanism does not manage accounts by directly confirming the username and password form, but by the security identifier (SID). The SID is created at the same time when the account is created. Once the account is deleted, the SID is also deleted. The SID information of the system is saved in the %SystemRoot%system32configsam file in the form of "SID s-1-5-21-xxxxxxxxxxxxxx-xxxxxxxxxxxxxx-005".

### 2. Origin and Consequences of the Scheme

This incorrect method comes from the previous way of handling the forgotten password in Windows 2000. Users of Windows 2000 (without installing Service Pack) can use this method to successfully crack the login password. The theoretical support of this scheme is: The password of Windows XP is stored in the sam file. When we log in to the system, the system will automatically verify the sam database information. If the password and username this time match the encrypted data in the sam file, the system will log in successfully. Otherwise, it cannot log in. If this file is deleted, the sam database will be cleared, and the login password of the administrator will also be cleared, naturally avoiding the login password verification mechanism of Windows XP.

In fact, this method is already invalid for Windows 2000 SP1-SP4, and is completely useless for Windows XP. If everyone operates on Windows XP according to this scheme, a situation of being unable to start will occur, bringing greater trouble to our operation.

### 3. Correct Solutions:

When the login password of Windows XP is lost, we can adopt different methods to solve it according to different situations:

(1) If when installing Windows XP, the Administrator password is set to empty. Everyone can press F8 to enter the safe mode when the system is booting. The Administrator password here is empty, and we can directly enter. After entering, we can set the account and password.

(2) If the Administrator password is set, the cracking method is not that simple. We can use the super-strong Windows 2000/XP system maintenance CD - ERD Commander 2003. After booting the system with this CD, run the command "Start → Management → Tools → Password Modification" to open the "ERD Commander 2003 LockSmith Wizard" window. Enter the account name to be cracked in the "Account" box, and then enter the new password. It's ok.

**Small Tips**:

★ERD Commander is shareware. Its official homepage is:
www.winternals.com/

The download address of the ISO file of the Chinese version of ERD Commander 2003 is:
soft.0zones.com/SoftDown.asp?ID=21081

Originally posted by martin325 at 2006-5-28 17:25:

If the method on floor 3 is feasible, it's extremely great!

If the system default username is Administrator, this method is always successful! I have successfully tried it many times

Methods to delete SAM, at least in 2KSP4 is useful, this has been tried on my friend's computer, and the result is successful.

It works on 2K as well

If you have installed the Windows XP operating system and accidentally forgotten the password of the system login user "*****", you can use the NET command to solve the problem:

In Windows XP, the "net user" command is provided. This command can add and modify user account information. Its syntax format is:

net user ]
net user
net user ]

Now, taking restoring the password of the local user "******" as an example, the steps to solve the problem of forgetting the login password are explained:
1. Restart the computer. As soon as the boot screen appears, press the F8 key immediately and select "Safe Mode with Command Prompt".
2. When the running process ends, the system lists the selection menu of the system super user "administrator" and the local user "******". Click the "administrator" with the mouse to enter the command line mode.
3. Type the command: "net user ****** intodigi /add" to force the password of the "******" user to be changed to "intodigi". If you want to add a new user here (for example, the user name is intodigi.com and the password is intodigi), type "net user intodigi.com intodigi /add". After adding, you can use the command "net localgroup administrators intodigi.com /add" to promote the user to a user of the system management group "administrators" and make it have super privileges.
4. Restart the computer, select to run in the normal mode, and then you can log in to the "******" user with the changed password "intodigi".

Cited from: http://www.intodigi.net/QA/System/WinXP/2347.html

Still, let's crack the password. There are many such software. Deleting SAM is not recommended. The success rate in XP system is not very high, which may lead to being unable to enter the system. You can first rename SAM, and if it doesn't work, change it back. Don't delete it first.

The method of the person upstairs is relatively safe.

Learninging

After downloading Brother Shenshan Hongye's system maintenance CD, burn it and boot from it. There will be a tool to reset the Administrator user password in the menu.

Enter DOS, create a new USER account. Then change the account to an administrator. Delete the original account. Then re - create the original account. Restart. OK

There may be possibilities on the 3rd floor.