Windows Features Blank on Windows 8

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SHORT VERSION
You're running Windows 8, and for some reason or another need to install the .NET Framework 3.5. Open up the Windows Features dialog, and its totally blank, without any add/remove options. What the heck?

FIX
Each of these command can take upwards of an hour to run. BE PATIENT, some of the dialogs sit there a while and seem to be stuck, but they're not. Open an elevated command prompt and run the two following commands

 sfc /scannow
dism /Online /Cleanup-Image /RestoreHealth

LONG VERSION
Although it didn't match my situation directly, I binged around and found this post ( https://social.technet.microsoft.com/Forums/windows/en-US/732ad60c-ecc6-4801-ac16-da474dace19f/problem-with-windows-features-on-or-off  ) which offered some potential solutions to fix Windows Features issues. I ran the commands as listed in the FIX section above. . After the command ran and I rebooted the machine, I could use Windows Features to install the .NET Framework 3.5 on my Windows 8 box.  I didn't think the command would take over an hour to run, and well, might have killed them once or twice when I thought they were stuck, so watch out.

Posted here for the SEO gods in the hope it doesn't cost someone else the 4 hours of research and fix that it took to resolve the issue.

ADDITIONAL READING