Firstly, remove the program 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.
After that, try running AdwCleaner to make sure that there are no leftover registry keys or toolbars in your system, navigate to the official web page, download the latest version of the program and install it following the on-screen instructions.
Once you install the utility, open the browser and enable it from the Plugins/Add-ons/Extensions menu. If you have issues, use the contact form from the official web page to get in touch with the support team.