I wanted to start all over again, so I deleted all the WordPress installation files AND the entire database (just because I wanted to.) Now that I've installed WP 1.5 I get the 'To reinstall please clear your old database tables first'-error. But I have no old tables to clear because I deleted the old database.
Could it be a matter of time? Maybe my host needs al little time to make the changes? Could that be it? Thanks!