I tried to upgrade from TC 9.0.1 to TC 9.0.2 and encountered an issue. I got an error saying "The Data Directory contains files or directories that don't belong to TeamCity." I thought, no big deal, this was a test install anyway, so I uninstalled TC completely. Cleared out the installation directory, and tried to do a clean install. Even after a clean install I still get the same error.
Any clues why I can't get it to work anymore?