Have you tried uninstalling via Fantastico? See, Fantastico also adds a file that it asks you not to delete at any time that it uses as an uninstaller. Usually, when uninstalled via Fantastico, the process will go through.
Also, as a side note here, during the installation of Wordpress via Fantastico, there is an option for Fantastico to email you the installation log. I've included an example below:
An instance of WordPress was installed on http://domainname.com
Full installation path: /home/xxxxx/public_html/domainname
Public URL: http://domainname.com/
Admin URL: http://domainname.com/wp-admin/
MySQL database: xxxxx_wrdp1
MySQL user: xxxxx_wrdp1
Time of installation: Saturday, 17th February, 2007 @ 03:40:39 AM
DO NOT REMOVE the file named fantastico_fileslist.txt from the
installation directory. It is used for uninstalling this application.
If you deleted the installation outside of Fantastico, try deleting it again via Fantastico to have it remove any remnant files plus the database created for it as well. Then try installing Wordpress again and email yourself the installation file for later reference.
One other note, after reading your other posts about this issue, the above suggestions might be a solution for your logon issue.