How do you remove Solarwinds Network Monitor database file?

How do I delete the existing database file used by the Network Monitor program in the Engineer's Toolset?  I went from a 2009 version to 11.08 version with a software uninstall, reboot, re-install, but it is still using the database and has issues with my older version on the newer software.  I want to start over fresh.  Please help.