Lol; 64-bit Edition isn't illegal there is a download for it. Longhorn is Illegal to download unless you are a Technet Subcriber or a high MSDN Subscriber. It is only an Alpha Build; which is why it is screwing up and doesn't fully work on his system at the moment.
Basically; you don't want the Alpha Build; its more stable than most but its not by any means mainstream stable. I'm sure it would be highly cool to school and say, I have Windows Longhorn, but its not worth the bother really.
Wait until its a Beta, and sign up to MSDN Standard to get it