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Maybe you can buy it at a Retail Shop?

'Consumers who are not using a Windows 8 device will be able to buy Windows 8.1, either as a download from Windows.com or at your local store as a retail packaged DVD product. '

Pricing and Packaging for Windows 8.1
http://blogs.windows.com/windows/b/bloggingwindows/archive/2013/09/17/pricing-and-packaging-for-windows-8-1.aspx

Maybe the Store App would work if you tested it as another Windows user?

Are you signed in with a Local Account or a Microsoft Account?

Introducing Windows 8: Should You Use a Local Account or a Microsoft Account?
http://www.7tutorials.com/introducing-windows-8-should-you-use-local-account-or-microsoft-account

What happens if you create and test with another Windows user?

Store - Enable or Disable in Windows 8
http://www.eightforums.com/tutorials/5804-store-enable-disable-windows-8-a.html

Ms Dart 8.1

Why won't the windows store download apps or updates?
http://answers.microsoft.com/en-us/windows/forum/windows_8-windows_store/why-wont-the-windows-store-download-apps-or/6bf18b87-ae76-4c39-9ede-5923274e06d8

See if the program can diagnose any problems and fix them.

Download and run the Modern UI App troubleshooter and check.
http://download.microsoft.com/download/F/2/4/F24D0C03-4181-4E5B-A23B-5C3A6B5974E3/apps.diagcab

Try clearing the Windows Store cache:

On the desktop screen, press Windows + R key to open run box.

Type WSReset.exe and hit Enter.

How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8
http://support.microsoft.com/default.aspx/kb/929135

This talks among other things that the Firewall not running could be a possible cause.

Fix: Unable to Install Apps from Windows 8 Store
http://www.thewindowsclub.com/fix-unable-install-apps-windows-8-store

Do you dabble with Registry Cleaners or 'Boosters'? They often cause weird problems.

Win8: App: Modern: Apps fail to start if default registry or file permissions modified
http://support.microsoft.com/kb/2798317