i think the diference from the tutorial might be between xp home and pro

there is another thing you can try

in my computer there should be a folder called "Shared Documents"
if you move the...

try folowing the steps at this tutorial
http://www.practicallynetworked.com/sharing/xp/filesharing.htm

information definetly helpfull

are you running windows xp?

chances are that you haven't set up the policy for sharing
and its asking for your administrator login/password