Unlike previous versions of Windows, XP should store passwords in hash form. Meaning that the actual password isn't saved, just it's computed hash value. If you had the hash, and knew how it was calculated, you should be able to get the password from that, but...
Even Microsoft isn't so careless about security that they would store the password in plain text in the registry or a similar place.
Is it possible to retrieve the password I started XP with ? I am a VB programmer, so have some skills I can use to look, if I know where to look.