[Newer]

How to change admin account password if you aready have access to an account on the computer (Windows XP Only)
Step 1: Click Start
Step 2: Run
Step 3: type control space userpasswords2
Step 4: The password Change window A window will open show all the users on the computer and (if your lucky) all the computers on the network. click on administrator and click reset password. type the password of your choice and click ok.
Step 5: That's it
now you can log off and log in again as administrator, or if your using this to get around a cache blocker type thing, right click internet explorer, click run as and then add administraor in the user box and enter the password that you created into password box.