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.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.
AdwCleaner will make sure to remove the add-on if Revo failed. Make sure to follow its guidance. Click Scan wait then click Clean and the add-on will be removed from your computer.