Can I just delete the old ArtSong 6 files?
No, please use the software uninstall facility located in the Windows Control Panel. ArtSong uses the Microsoft Installer (MSI) service to perform installation. The MSI service makes many registry entries and uses them to perform its uninstall, maintaintance, and repair operations. Just deleting the files will leave the registry entries intact and MSI will continue to view the program as ‘installed’.