Just follow these simple steps to log in.
1.You need two things to do this -1] pen drive 2] konbootinstall.exe software.
2.download the konbootinstall.exe here- DOWNLOAD
3.After downloading this software connect the pen-drive to your pc.
4.Now open the konbootinstall.exe--command prompt window will be open.
5.then enter the drive letter of the pen-drive which you have connected to pc and press enter.
6.Here we go.......now your Pen-drive is the tool to login to any password protected pc.
this software is very secure method to login to any pc because it wont change or remove the login password.
NOTE:This Log in trick will work only when the pen-drive is connected to any Pc before booting.