Have put me out of admin

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http://askubuntu.com – Installed a new user and then tried to create one with the name root, because sudo nerves. Didnot work and i have learnt in the meantime, this is not possible. ok, but now my admin log in doesn´t work, home/marek/.ICEauthority could not be updated. It is there, but perhaps set to read only. I can go to "user" there the password works, but sudo under the new user doesn´t and the try is somewhere reported. How to change in the terminal now to root and repair this ICE? (HowTos)