Control Panel, Users, Create a New user - (Enter Name), then set a
password for the account. Log into that account one time. Then log
into the Administrator account. Right Click My Computer, then click
Properties, Advanced, User Profile, Settings. From the profile listings
left click the original profile name to highlight. Then click Copy to ,
then Browse to the newly created account/profile at:
C:\Documents and Settings\'NewProfileName' (Make sure it's correct)
then click "Permitted to Use" and add the new profile/username.
Now log into that new account and it will be a "Mirror" image of the
original that you wanted to change the name.