About as close as you can get to this would be to create a new administrator account
with the name you like, then copy all of the contents of the old user account's C:\Users\(user-name)
folders (including hidden AppData
folder) into the corresponding new account's C:\Users\(user-name)
folder. After everything checks out ok, you can delete the old user account while logged in the new user account.
It will copy most of your settings, like your Start Menu shortcuts, to the new account, but items stored in the registry, like your desktop background, would have to be reset again.
Hope this helps some,