often have friends to Xiaobian response: installed Windows XP operating system, accidentally forgot the system login user password, and did not make the corresponding emergency disk during installation, what should I do? After a lot of attempts, I found the following ways to solve the problem. Now I will introduce these methods as follows:
Method 1——Using “administrator” (This method is applicable to administrator username is not “ The situation of administrator”
We know that in the process of installing WindowsXP, the default is to log in as “administrator”, and then ask to create a new account to log in with Windows XP when entering Windows XP, and the login interface in Windows XP Only the created user account will appear in the middle, and there will be no “administrator”, but the account still exists and the password is empty.
When we understand this, if you forget the login password, on the login screen, hold down the Ctrl+Alt key and then press the Del key twice to display the classic login screen. Type " administrator” in the name, enter the password blank, and then modify the password of "zhangbp".
Method 2—— Delete SAM file (note that this method is only applicable to WIN2000)
Windows NT/2000/XP uses security account manager (SAM) for security management of user accounts. Mechanism: The security account manager manages the account by using the security identifier. The security ID is created at the same time when the account is created. Once the account is deleted, the security ID is also deleted. The security identity is unique, and even with the same username, the security identity obtained each time it is created is completely different. Therefore, once an account is rebuilt by a username, it will be given a different security ID and will not retain the original permissions. The specific performance of the security account manager is the %SystemRoot%system32configsam file. The SAM file is a user account database for Windows NT/2000/XP. All user login names and passwords are saved in this file.
Knowing this, our solution has also been created: delete the SAM file, start the system, it will rebuild a clean and innocent SAM, which naturally has no password.
However, such a simple method is not applicable in XP, Microsoft may use this as a BUG, and made restrictions … … so now under XP system, even if you delete the SAM, you can not delete the password, but instead Make the system startup initialization error, and enter the infinite loop and can not enter the system!!
Method 3—— Find the password from the SAM file (premise …… will use DOS basic commands)
Before system startup Insert the boot disk and enter: C:WINNTSystem3Config Use the COPY command to copy the SAM file to the floppy disk. Get another machine to read. The tool needed here is LC4, run LC4, open and create a new task, and then click “IMPORT→ImportfromSAMfile” to open the SAM file to be cracked. At this time, LC4 will automatically analyze this file and display the user in the file. Name; then click “Session→BeginAudit”, you can start cracking the password. If the password is not very complicated, the result will be obtained in a short time.
However, if the password is more complicated, it will take a long time, then we need to use the following method.
Method 4—— Overwrite with other SAM files (provided you can get the SAM file of another computer and its password … … personally think it is the most feasible way)
1—— Said, the SAM file holds the login name and password, then we just replace the SAM file is to replace the login name and password.
However, the replacement SAM file should be the same as your system (see FAT32 or NTFS, you can confirm it yourself). It is best that the system of "Place of Origin" has no password, the security settings have not been moved (actually a large part of the PC is like this), of course, the more insurance way is to cover all the files under XP WinNTSystem32Config Go to the C:Win NTSystem32Config directory (assuming your XP is installed in the default partition C:),
2—— if you don't get help from others (I mean "just in case"), you can be in the other On the partition is installed an XP system, the hard disk partition format should be the same as the original, and please be careful not to install the same partition with the original XP! Before starting, be sure to back up the boot area MBR in advance, backup MBR method A lot, use tool software, such as anti-virus software KV3000. After installing it, log in with Administrator. Now you have absolute write permission to the original XP. You can test the original SAM and get the original password with 10PHTCRACK. You can also overwrite all the files under the newly installed XP WinNTSystem32Config to the C:WinNTSystem32Config directory (install the original XP installed here), and then use the KV3000 to restore the former grievous main boot area MBR, now you can log in as Administrator. XP is out.
The next SAM, so that you can delete the current password and restore to the password when you first installed the system. If this password is empty, it is not ……