If uninstallation by program features in control panel does not work, it is helpful to remove it from register and reinstall the program to uninstall again properly by a well-working reinstalled program.
Remove a program registry file from the below path.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall HKEY_CLASSES_ROOT\Installer\Products
Guava & Mango 