This seems a very strange problem/question to me. When I first installed my OS windows 7 I created a username Jacque (administrator), and after several months, I changed the username to Jacques. Now in the logon screen it is Jacques which seems normal, but in the C:/Users directory, it is still Jacque. It didn't bother me at first until sometimes when I was requested to offer my username by some software, if I input Jacques (the new one), I would be blocked for inputting a wrong username. I have to input the old one (Jacque) to make it work.
So I wonder what is actually my username? Can I delete the old one permanently and stick only with the new one?