Angelfish contains a utility named "uninstall" that will remove the application files and the default directories. If you changed the location of the data directory, you will need to manually delete the data files and directories (i.e. rm -rf /datadir/*)
Your current directory must not be the Angelfish install directory in order to run the uninstall binary.
Angelfish can be uninstalled from the "Programs and Features" setting in Control Panel. Highlight Angelfish in the Installed Programs list and click "Uninstall / Change".
You may also use the command line to run the \uninstallangelfish.exe binary. This deletes all files and directories associated with Angelfish and completely uninstalls the application.