I upgraded my 13" MBPr to a 15" MBPr and before I traded in the 13" I backed up using Time Machine. I got the 15" up and running and used the Migration Assistant but I'm a little confused as to what to do. During the initial opening sequence it said that the migration assistant could not migrate the data because there was an exact same user name as the backed up data. On my new 15" laptop I use the same name as my previous laptop but not sure what I should have done. Now I've got 2 admin users and the one won't let me delete the user because its greyed out. Any ideas to get around this?