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.
Once AdwCleaner finished, reboot the PC then run it again and scan the PC. Sometimes you have to run the software twice in order to completely remove it.