I'm a new Samsung Galaxy S3 user. I've successfully installed Android version 4.1.1. I'm finding I cannot install a couple gaming apps (Flow Free, Jewels 1.999a). I try to uninstall the apps via the Settings->Application Manager and I get the following error message: "Unable to uninstall: Package is an active device administrator" There is a button underneath to "Manage device administrators" but when I select it, I get the message "No device administrators available" under the heading "Device administration settings". In Settings->Security there is an option for device administrators which yields the same text when chosen "No device administrators available". Can anyone help me understand what is happening, why and how to fix it? I haven't been able to find much that explains relevant aspects of device administration from the phone owner perspective, just more from the design perspective. Not sure of its relevancy but I have a Google user id but am not actively using Google mail. I am logged in and am able to use Google Play etc. I use another email address for which I sync data to outlook on my PC as I prefer to keep my mail private.