1- Put the created CD from the ISO image in CD rom and Boot from it.
2- This is a Linux CD boot... so you wil see alot of things passing through your screen... don't worry... just let it go!
3- When everything stops, type ( a ) and press Enter -> "a" for "Show all Partition"
4- Choose the Drive where windows is installed (generally drive C:) so choose ( 1 ) and press Enter.
5- in the next options just press Enter (2 times for the next 2 stops)
6- Choose ( 1 ) for SAM System Security
7- Choose "Edite user data and password"
8- the user "Administrator" is the default... so don't change or type anything!
9- in the next options just press Enter (2 times for the next 2 stops)... the Defaults are good so don't chage them!
10- in Please Enter new password just type the Star ( * )... * and Enter
11- When ask for "are you sure you want to change..." type ( y )... y + Enter
12- Quit the program by typing ( ! ) "exclamation point"... ! + Enter
13- Everything is ready!
14- Reboot the computer. Don't worry about the options on the screen!
15- if you have a Network login system (username + password), in login menu for username type "Administrator" and without password press Enter...
16- if you have a "Login Screen" like your home computer so during rebooting computer press (F8) and in the boot menu list choose "Safe Mode" and boot from there... in Login Screen choose Administrator and log into the windows...
17- when the login is complete in Safe Mode or Normal mode depending on your login system, go to Control Panel in User Account and choose you account and make it Administrator (in Normal network login this may vary from the home computer. in this case in user account choose your account and press Properties in the new opened window choose "Groupe Membership" tab and at the bottom in "Other" open the combobox and choose "Administrator". Press Apply and OK...)

Now you are done! you can login with your user and do everything like the Administrator! installing, changing, modifying and so on...!!!!

Again Form Atilopatil... How to hack Administartor Password on all Windows NT (NT 4.0 / Windows XP / Windows 2000 / Windows 2003 Server)