If you try to upgrade from Windows 8 to Windows 8.1 using the Windows store it might tell you that it cannot upgrade as you are not am administrator. But if you are an administrator and it tells you this what should you do?
You can try this as it has worked on some computers:
First, find where all the updates for windows are listed. Go to Control Panel —> Programs. Then under Programs and Features, you’ll see a link called “View Installed Updates”. Under Microsoft Windows, scroll until you find KB2871389. Uninstall it, and then accept the prompt to reboot your computer.