****.. stupid mistake i know, but i dont kno wmy admin username - when first logging into leopard it simply says "other.." - i know the password.... anything i can do ????
you would have to do a clean install, and restore any data left on there from an archive and install by backing it up to another computer first which can be done by borrowing a friend's Mac and starting yours in target disk mode, you may be able to see your home folder from there to and then you would not need to do a clean install though.
Seeing other at the login screen usually means you've enabled the root user. It should be disabled unless you need it. Here is more information on the root user.
Nevertheless, if you boot from some OS install discs you should be able to use the Password Manager to change a password.
Hold C to boot from a CD. Read up on the root user article and see if anything there rings a bell. In the meantime, tell us exactly what you were doing before this all happened?
Slow down. I really don't think that's necessary. In one of the menus there should be a Password Manager or something similarly named. Use this to reset your account's password.