This was all ready installed on some Dells that were going to be scrapped. The install on one system was screwed up so I didn't have the registration form.
I am going to upgrade from this version due to compatibility issues so thanks for your answers.
I recently reinstalled windows and put Autocad 2004 back on there but it asks for an authorization code. It did not when I installed from disk. Just to be clear I am not asking for the codes, I just need an explanation.