Vista Beta 2 - Unable to Login

I just got done installing Vista Beta 2 here. I set up my name, and chose my
background, but now it's asking me to log in, showing only the Administrator
Account. I don't know what the password could be, and when I choose "Switch
User" I only get "Other User" and I can't get in with my name I typed. It's
crazy.
I logged in under Safe Mode, but it doesn't keep any of the changes I make
to user accounts.

Any ideas?

Thanks!