Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will uninstall it by wiping out all traces of its presence from the system. But first you should check if it has its own uninstaller by using Add or Remove Programs in Control Panel and then you can proceed further.
After that, try running AdwCleaner to make sure that there are no leftover registry keys or toolbars in your system.
