I have problem with this app

 . It says i have to reinstall this so i downloaded update. When i run it says i have to uninstall current app - DBAR, so I did it. When I'm trying to istall it, it says 'factorysetup error 5' so I can't install It.

What can I do when my all programs are working properly, but this one app is wrong and I can't reinstall OS because of it.