Go to the installation folder located in the My Computer > Local Disk (C:) > Program Files and right click on the uninstaller. Select Run as Administrator and try to uninstall the application following the self explained steps.
If this doesn't work, use 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.
