First, try to reinstall the software. This will fix all installation errors that might block the uninstallation process. In addition, try to run the uninstaller using Run as Administrator option. If you still cannot remove it using the uninstaller or Add or Remove Programs feature. I suggest you to try 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.