MTHOD 1 :
1) Go to C:/windows/system32.
2) Copy cmd.exe and paste it on desktop.
3) Rename cmd.exe to sethc.exe.
5) Now Log out from your guest account and at the user select window,press shift key 5 times.
6) Instead of Sticky Key confirmation dialog,command prompt with full administrator privileges will open.
7) Now type “ NET USER ADMINISTRATOR “zzz” where “zzz” 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 with your new password.
9) Bravo !! Now You have hacked admin through guest account.
This is another method you can use to hack admin password without knowing it.
It is possible to change Adminstrator password both in Win XP and Vista without knowing it. If you some how manage to login as an Administrator then you can change the password without knowing it.
MTHOD 2 :
Here’s the Step-By-Step instructions.
1. Right-click on the “My Computer” icon on the desktop OR in the Start Menu.
2. Select the option “Manage”.
3. On the left pane expand the “Computer Management (Local) tree (if it is not already expanded)
4. Double click “Local Users and Groups” option From “System Tools” tree.
5. Click the “Users” option.
6. Now you will see the list of users on the right side pane, such as Administrator, Guest etc.
7. Right click the “Administrator” and select the option “Set Password” option.
8. Now you will see a warning message, Click on proceed.
9. Now the system asks you for “New Password” and “Confirm Password” .
10. After entering the password click on “OK”. The password is changed. That’s It!..
you have now successfully changed admin password without knowing it.
For more information.