Perhaps the installation is corrupted. Has it every worked for you. If so, try a repair on it - under help_detect and repair.
If you cannot get that far, then go into add/remove progs and try a repair from there (instead of uninstall).
iPhone X review
Political cartoons in 2017: Chris Riddell, Rebecca Hendin and Dave Brown on what it’s like to…
The best iPhone for 2017
Tennis : comment regarder la finale de la Coupe Davis 2017 ?