How to change admin password from guest account

1) Go to c:/windows/system32.
2) Copy cmd.exe and paste it on desktop.
3) Rename cmd.exe to set sethc.exe.
4) Copy the new sethc.exe to system 32, when Windows asks you for overwriting the file, then click yes.
5) Now logout from your guest account and at the user select window,  press shift key 5times.
6) Instead of sticky key confirmation dialog box,  command prompt with full administration privileges will open.
7) Now type "NET USER ADMINISTRATORXYZ"  where xyz can be any password you like and press enter.
8) You will see "The command completed successfully" and then exit the command prompt and login into administrator account with your new password.