Yep. Searched for "Media Center" and "Features" but got nothing.
Not too concerned about Media Center but starting to wonder if anything else hasn't gone quite right.

Did you previously install any of the previews or was it a straight Windows 8 retail to Windows 8.1 retail upgrade?

Straight upgrade from retail 8 to 8.1 using the store.

Microsoft seem to have gotten rid of the Windows Experience Index which is a shame - but then I suppose few people actually used it.

I believe that you can still run winsat.exe from the command line.

In reply to a post by AEP:

Microsoft seem to have gotten rid of the Windows Experience Index which is a shame - but then I suppose few people actually used it.

I believe that you can still run winsat.exe from the command line.

Winsat.exe dont work for me.

You have to run it as Administrator.

Still nothing, open and closed cmd prompt is all I get.

You are opening the command prompt with "Run as Administrator"? Works fine on my system.

Didnt realise it was a cmd prompt output, was expecting a GUI. winsat formal runs ok and outputs details in admin cmd prompt.

Updating from Windows 8.1 Preview to Windows 8.1

Thank you for using Windows 8.1 Preview. The final versions of Windows 8.1 and Windows RT 8.1 are now available online and in the Windows Store.

The preview is no longer available for download. You must install the final version of Windows 8.1 or Windows RT 8.1 before January 2014 when the licence for the preview will expire. If you've been using the preview, you should update to the final edition as soon as possible to avoid an interruption in using your PC.
Updating to Windows 8.1 or Windows RT 8.1

Your options for updating to Windows 8.1 depend on how you installed Windows 8.1 Preview or Windows RT 8.1 Preview.
I installed the preview from the Windows Store or I installed the preview using media while Windows 8 was running
I installed the preview by booting from ISO media
Returning your PC to its previous operating system

In some cases, you might want to go back to your previous operating system before updating or upgrading to Windows 8.1. You have different options depending on which version of Windows your PC was running before you installed the preview.
Warning
Warning

When running Windows 8.1 Preview, if you used the Add Feature function to change editions, you might need to reinstall or reactivate using your same edition product key. To find out more about changing product keys, see KB2750773.

My PC was running Windows 8 before I installed the preview

If your PC was running Windows 8, you might be able to restore it back to Windows 8 using PC refresh. Your personal files won't be affected, but applications that did not come with the PC will need to be reinstalled and apps that you installed while using the preview might not be available through the Windows 8 Store. To find out more about using PC refresh, see Restoring, refreshing or resetting your PC.

If your PC was running Windows 8 and you installed the preview by booting from media, you'll need to restore your original operating system by using recovery media created prior to installation or by following instructions provided by your PC manufacturer. You can then install Windows 8.1 through the Windows Store. For detailed instructions, see Updating to Windows 8.1 from Windows 8.
My PC was running Windows RT before I installed the preview
My PC was running Windows 7 before I installed the preview
My PC was running Windows Vista or Windows XP before I installed the preview

please do take care to install windows 8.1 to avoid any problems

http://windows.microsoft.com/en-gb/windows-8/update-...

http://www.microsoft.com/en-us/news/press/2013/oct13...