just to have that said: the database as such reads nothing, the application you create reads from and writes to a database.
it seems you're hosting your site actually with WebWiz (IIS7) so why not using (or at least starting with) the available code and database from the forum?
bruce pointed me to the
API for syncing WebWiz forum login to something else, so just decide which database you like to use (IMO preferrably MSSQL) and here you go ...
to stealthen especially login against hacking is not really trivial, so you might want to consider relying on proved code ..
christian