If you forgot your password you can install a software that acts like a os call Hirens BootCD
Follow these steps to reset your password
# Choose and download CD or USB software.
# Boot from the CD or USB.
# Select Mini Windows XP from the menu.
# Select HBCD menu to Launch the Program.
# Navigate the menu to NTPWedit.
# Change Path to the Appropriate Drive.
# Click on the username in the User list.
# Click on Change password.