Shulou(Shulou.com)06/01 Report--

First, forget the boot password

The power-on password refers to the password that pops up after you turn on the computer to post. At this time, you can only start the system after entering the correct password. When this kind of password appears, you don't even want to access the computer's BIOS settings, so the security is relatively good. (it is recommended that laptops do not set this kind of password. Because once you forget your password, and then lose the corresponding decryption disk, you will have to go to the notebook manufacturer maintenance shop to burn money. Solution: open the chassis, take out the CMOS lithium battery on the motherboard, then put it in for a while (5-10 minutes), and the password will disappear automatically. Principle: because the boot password is set by BIOS, it will be saved in the CMOS on the motherboard. The content of this memory will disappear after a long power loss, so the password will disappear.

Forget the password set by BIOS

The password for BIOS is set when entering BIOS during post by pressing the corresponding key (different BIOS keys are different for Aword and DEL for AMI). The boot password is also set here. This password protects the permissions set by BIOS. It does not affect the startup of the practice system. Solution: you can discharge it through CMOS, but it's best to clean it up with debug. Because always fiddling with computer hardware, it will make its service life shorter. After starting the practice system, enter the DOS environment, enter the debug command, and the "-" input prompt appears, and then enter the following command

-o 70 10

-o 71 10

-Q

I believe that through this practice, the password can be cleared.

Principle: the numbers 70 and 71 are used on the command line, because data access in CMOS is achieved through the 70 and 71 I big O ports. Port 70H is an one-byte address port, which is used to set the address of data in CMOS, while port 71H is used to read and write the data unit contents of port 70H setting CMOS address.

Forget the login password of Windows98

Some employees will restrict login by changing the Windows registry and the corresponding login method. If they enter it incorrectly, they will prompt for the appropriate information and cannot log in. The general windows network login method can not use the local area network even if you log in without entering the password. Solution: before the computer starts the self-test and then starts the practice system, press the F8 key, bring up the startup menu, select safe mode (safe mode) and enter the practice system. Look for the file with the suffix pwl in it, then rename or delete it, then change the login mode, and the corresponding password is automatically cleared.

Principle: the file with pwl as the suffix is a password file with the file name as the login name. After deleting it, the corresponding password disappears.

Forget the login password of WindowsNT/2000

In order to ensure the security of WindowsNT/2000, it is generally required to set up practice as the system login password. You can't log in without a password. Solution: first of all, to distinguish between the practice system file format is FAT or NTFS, because it is NTFS, some boot disk can not be practiced as a file, because this practice to change or delete files. If FAT, you can start the computer with a general Windows98 boot disk, while NTFS needs other tools, such as NTFSDOS, which can make two Floppy boot disks and then practice the files under the NTFS file format. Start the computer with the boot disk (now in dos), enter the partition where the system is located (such as disk C) and rename or delete the c:\ windows\ system32\ config\ sam file, you can log in the next time the login password is empty.

Principle: because c:\ windows\ system32\ config\ sam this file in the practice system is equivalent to a database file used to save the password of the current system user, when deleting or changing this file, the system thinks that there is no password, and the next time it starts, it will generate a SAM file.

Forget your Windows XP login password

Solution 1. Use the net command (assuming the user name that forgot the password is xxcxz)

We know that the "net user" command is provided in Windows XP, which can add and modify user account information in the following syntax format:

Net user [UserName [Password |] [options]] [/ domain]

Net user [UserName {Password |} / add [options] [/ domain]

Net user [UserName [/ delete] [/ domain]]

1. Restart the computer, press the F8 key immediately after the startup screen appears, and select "safe mode with command line".

2. At the end of the running process, the system lists the selection menus of the system superuser "administrator" and the local user "xxcxz", and the mouse clicks "administrator" to enter the command line mode.

3. Type the command: "net user xxcxz 123456" to force the password of the "xxcxz" user to change to "123456". If you want to add a new user here (for example, the user name is abcdef and the password is 123456), type "net user abcdef 123456 / add". After adding, you can use the "net localgroup administrators abcdef / add" command to promote the user to the user of the system management group "administrators" and give it super privileges.

4, restart the computer, choose normal mode to run, you can use the changed password "123456" to log in to the "xxcxz" user.

Solution 2. Use "administrator"

We know that in the process of installing Windows XP, we will first log in by "administrator" by default, and then we will be asked to create a new account so that we can log in with this new account when entering Windows XP, and only the user account created will appear in the login interface of Windows XP, not "administrator", but in fact, the "administrator" account still exists and the password is empty.

When we understand this, if we forget the login password, in the login interface, press and hold the Ctrl+ alt key, and then press the Del key twice, you can appear the classic login screen, at this time, type "administrator" in the user name, the password is empty to enter, and then change the password of "zhangbp".

Forget your Linux root login password

Linux is another practice system that is very different from the Microsoft training system, which is applied to the company's servers. It has good security, and its kernel is free, but the practice is a little more complex. The root account is the default login password for practicing system administrators in Linux, which is equivalent to Administrator in Microsft windowsNT/2K. After logging in with root, you have a lot of administrative practice. Since you can change all root passwords, then other user passwords are a piece of cake. But you have to restart your computer when you change your password, and methods like Telnet may not be able to change it.

Solution one. Lilo

Type linux single at the lilo: prompt

The screen shows that the lilo: linux single enter computer can go directly to the linux command line # vi / etc/shadow after starting.

Delete the first line, which begins with root, after root: and before the next:

The first line will be similar to

Root::.

Save # reboot restart, root password is empty

Solution number two. Grub when the grub screen appears, use the up and down keys to select the item in which you normally start linux (do not select dos yo), then press the e key to select the item in which you normally start linux (similar to kernel / boot/vmlinuz-2.4.18-14 ro root=LABEL=/), and then press e key to modify the command line you see now and add single. The result is as follows:

Kernel / boot/vmlinuz-2.4.18-14 single ro root=LABEL=/ enter, then press b to start, you can directly enter the linux command line # vi / etc/shadow

Delete the first line, which begins with root, after root: and before the next:, and the first line will be similar to

Root::.

Save # reboot restart, root password is empty

Solution 3. Take off the hard disk of this machine and hang it on other linux systems, using the same method as the second one.

Principle: in LINUX practice system, all kinds of files are placed in a fixed directory (UNIX is also the case), "/" is the root directory, and practice as the system login password is placed in the / etc directory, if the login password is encrypted, it is placed in the shadow file; and unencrypted is placed in the password file (because there is no use of linux for a long time, this file name is not very clear). Find the appropriate user life to be encrypted, and delete the password on the appropriate item (because the contents of this file are placed in a fixed format).

Forget the WIN7 password

We have been using windows7 system for more than a year. If our win7 system has set the user password, at boot time? Accidentally forgot the win7 boot password, what should I do? the security level of the win7 system is higher than that of XP, and the solution to this problem is not the same as that under the XP system.

The easiest way is: when you boot to the welcome screen, you will be prompted to enter your user name and password and press Ctrl+Alt+Delete? Jump out of the account window and enter the user name? administrator? Just enter.

What if this administrator account also has a password? So you can do this?

Press F8 to select "safe mode with command line" when the win7 system starts.

Select "Administrator" to jump out of the "Command Prompt" window

Add more users? net user asd/add

Promoted to administrator? net localgroup administrators asd / add

Restart? Select asd to enter

Control panel-user account-users who forget their passwords-do you delete the password?

Besides the above? Are there two other common situations where you forget your win7 system password?

Forget your password? But is logged into the system.

This situation is relatively simple to solve, first enter "mmc.exe" in the search box in the start menu? Or hold down Win+R? Open the run window and enter "mmc.exe" and click OK to enter the console. Open "File"-"add / remove snap-ins"? Find "Local users and groups" in the available snap-in on the left? Click add-finish? Then click OK. Expand the local users and groups in the console root node? Select "user"? Right-click on the right user name? "set password"? There is no need to enter the original password here.

Forget your password? Unable to log in to the system.

1. Find a PE disk to start the computer

2. Enter PE and go to c:\ windows\ system32

(1) change the owner of Magnify.exe and cmd.exe to? administrators

(2) change the permission administrators of Magnify.exe and cmd.exe to full control

(3) rename Magnify.exe to Magnify.exe1 and rename cmd.exe to Magnify.exe

3. Change the password

(1) restart to windows 7

(2) enable magnifying glass

(3) the rest is very simple, enter the command "net user" to view the user name? Then enter the command "net user username New password". ? Activate the administrator account using net user administrator / active:yes, then close the command prompt window and enter the new password you just set in the login password box. See if you have successfully entered the system, and finally, don't forget to change back all the previously moved and renamed files, which is a serious backdoor.

Forget your password? Unable to log in to the system. It's troublesome to deal with this situation. I've tried safe mode, Win7 system disk repair, logging in to WinPE? But can not modify the system files, it seems that the previous Vista method can not be used. My method is similar to logging in to WinPE to modify the file. You need a Ubuntu to install CD? The version I use is the 8.10 desktop version. Select CD to boot? Enter the Ubuntu installation interface? Choose a language? Then enter the first item "try ubuntu without changing …" . Then wait for the file to be loaded? Will it take a little longer? After entering the desktop? Open the X:\ windows\ system32 folder of Win7? Cut the "osk.exe" here to another location? Change "cmd.exe" to "osk.exe"? Then reboot from the hard drive. Can you also try to use Win7 optimization master software to the Win7 login window? Click the "easy access" icon in the lower left corner of the screen? Then check "launch screen Keyboard" in the pop-up window? Click OK? What starts at this point is the command prompt. The rest is very simple. Enter the command "net user" to check the user name. Then enter the command "net user username New password". Finally, close the command prompt window and enter the new password you just set in the login password box. See if you have successfully entered the system. Finally, don't forget to change back all the files that were previously moved and renamed.

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