Sekushi

Just wondering...I'm trying to uninstall the phpbb's that I had on my site to replace them with clean new ones. It seems that their mysql counterparts no longer exist, and now I cannot access the boards at all to go into the control panel. However, if you visit the link, rather than getting a 404 error, you get an error saying that phpbb is trying to connect to the database but cannot. What should I do?