[eluser]Phil Sturgeon[/eluser]
There are a few issues with the installer which should be ironed out and released as part of v0.9.7.
Can you check to see if the database has actually been created? There was a problem that would cause this error to pop up even when the installation had been run successfully.
If all else fails, look at the INSTALL file in the root and follow its instructions. It should help you manually install by running SQL and a few bash commands. Nothing more complicated than setting up phpBB or some other popular script.