I need to figure out how to reset the administrator on my Dell Latitude E5420 laptop without knowing the administrator password. It is an old school laptop that I was allowed to keep when I graduated, still runs through the school domain and I have to log on through that. But I want to remove all of this and make the laptop mine. I do have permission to do so but no one seems to know who the administrator is or what the password is. I have tried resetting it using a burnt windows disc but this did not work. I have backed up everything to my external hard drive as well. I just need to know how to format the laptop without the administrator password. Please help.