I uploaded WP 3.0 enabled then disabled my blog network. Now I'm trying to enable the blog network again. I got the message "An existing network detected." Based on some recommendations I got from another php admin, I started looking through my wp-sitemeta tables in phpmyadmin. I need to know which tables might be the "existing network" detected by WordPress, so I can set up a new network. I'd like to delete the old blog network and replace it with a new one without having to delete and reload my WordPress site, if possible.