Which operating system ?
Restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer
Windows Advanced Options Menu
Please select an option:
Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode
Start Windows Normally
Reboot
Return to OS Choices Menu
Use the up and down arrow keys to move the highlight to your choice
select safe mode with command prompt
Click start run type cmd press Enter
black screen should open DOS mode
this will vary depending on your operating system
type in net user username
For eg. If you want to change administrator password , type net user Administrator
It will prompt you to enter the new password.
Enter the new password and the password is changed
or
Click "Start," then select "Run." In the text box displayed, enter "control userpasswords2" and press "Enter." This opens a configuration window.
Click the user for whom you want to disable the password login.
After selecting the user, remove the check mark labeled "Users must enter a username and password to use this computer."
Click "Apply."
A dialog box will prompt you for the password.
Enter the user's password to authorize the changes and press "OK."
Reboot your Windows XP computer.
When it shows the list of user profiles, click the user whose password was disabled.
You should be able to log in without a password.
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