Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system. To find your application, click on Advanced Uninstall then look for its entry. Once found, proceed with the uninstall.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.
