doing RESTORE created new administrator account. Why?
 

I recently wanted to go back in time on my winXP box and used "system
restore" to go back to a known good point in time.

All went well, except that for some strange reason doing this caused winXP
to create a new profile (named "Administrator.hostname") and use it instead
of the perfectly good profile named "Administrator".

Why? How can I keep this from happening in the future?
How, short of using regedit, can I go back to the old profile name (maybe
just deleting the profile called "administrator" and renaming the new one to
have the name "administrator".

thanks,