Reinstalling Sneak Preview SAP Netweaver 2004s for ABAP

I had an error, installing the sneak preview.

So I want to reinstall it, so when I was in the uninstall.

I couldn´t erase the MAXdb, when I wanna drop the NSP db the program ask me user name and password.

I put in user name: superdba and password that I have set it before (in the installation)

I he tell me that is incorrect ¬¬ Im sure that the pass is okey, so what I wanna know is which is the name that SAP use it to name the admin of the DB, because superdba is not working.

and if the name is really superdba, there is a way of unistalling the MaxDB ???