Reset Administrator Password in Windows 7 and XP

 This Guide is help these people who forget his password and surfer with data lost problem.
       
1. Boot from Windows CD/DVD and access the command prompt.
Insert bootable cd to pc----> press F10/F12 to boot from CD --> choose CD/DVD Drive and Enter-----> Install now ----> Repair your PC-----> Next------> Choose Command Prompt from System Recovery option----> use following Command in command prompt.
2. Find the drive letter of the partition where Windows is installed. (Replace “c:” with the   correct drive letter if Windows is not located on C:)
3. These commands make a backup of sethc.exe to restore later.
     c:\>copy c:\windows\system32\sethc.exe c:\
4. Type this command to replace sethc.exe with cmd.exe:
     c:\>copy /y c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe
5. Reboot your computer and start the Windows. After you see the logon screen, press the SHIFT key five times.

6. You should see a command prompt where you can enter the following command to reset the Windows password (see screenshot above):
   c:\>net user your_user_name new_password
7. If you don’t know your user name, just type command net user to list the available user names. 
8. You can now log on with the new password.