This is a new one for me. I have a workstation, XP pro that has only one user called 'user' and no program files.
I have tried to boot into safe mode, but get the same thing, the user, 'user' no prompt to change it.
This computer previously had at least two other users.
I can explore, sort of..... The 'C' volume has been renamed 'ComboFix' When you expand it to explore it dups the previous window.