Special character as admin username - cannot find it from keyboard

I was installing Vista Home Premium for first time and keyboard was not
working so I decided to give a special character as user name and change it
later. I selected character with left mouse button and it was last special
character in pull down menu.
I did not give any password - it was left empty.

It was something like "US backspace" or similar character. Now I cannot
login first time, because left mouse does not give similar pull down anymore.
Space is not working.
I don't have recovery disc, because I haven't been able to start windows for
first time.
It was not one of these special character, but something else.
http://home.earthlink.net/~awinkelri...shortcuts.html