Reset Windows xp/vista/7/8 administrator password Without knowing it (FULL Tutorial with Screen Shots):-
Steps:-
Under this section double click on Computer Management.
Now you will see all the log in accounts of your computer.Right click on any the account whose password you want to change and then click on Set Password.
A warning message will popup on your screen just click on Proceed button.
Now enter your New Password and confirm it and click on OK button.
That’s it! your windows password is reset.
NOTE:-The only limitation of this method is that your current account should have Administrative privileges.