I don't understand--How were you able to start up if all the users in Users were deleted? Do you run as "root"/or "superuser"?
Anyway, when safari was released as a beta, something like your 'lost user' occurred. The discussion isn't on the Apple boards that I can find (archived?), but I did find this:
http://www.macwrite.com/yourturn/saf...nstable-pf.php If you have experience using the terminal, maybe those ideas can help.
Sorry I can't help more. You should try to get in touch with
bugs@limewire.com and try to detail as much as you can of just what steps might be needed to reproduce the problem. The installer works fine for most, so there needs to be a very unusual step somewhere for this to happen.
Do post back if you can find out more--it's a sad and very unusual problem.