update
Hi
I'd download a fresh version.
Then I'd delete the database and create another one, Unzip the files to your chosen directory.
The before you run the install look at the php files in the root such as privacy.php
There should be code above the head tag with connection details etc.
If they are there run the install and check the file after.
Any problems I'll be around this weekend trying to get a site functional
cheers
Ian