Occasionally, the Symphony entry in Apps & Features becomes a residual entry which you cannot uninstall from the Registry Editor.
Remove a residual Symphony entry from Registry Editor:
- Open the Registry Editor from the Start menu.
- Navigate to \HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Symphony and remove the Symphony folder. The residual version of Symphony will be removed from your machine.