Windows 8.1 Update Causes Lost Brightness Settings / Screen is Dim

 I updated from Windows 8 to 8.1 and the next day my screen went dim and I could not adjust it neither with the keyboard +/-, nor with the onscreen graphics dashboard, nor within the power settings.
How do you fix it? 

Sometimes Windows updates will break your graphics driver. That is because Intel and NVidia do not update their graphics drivers on the same schedule that Microsoft
updates Windows, and sometimes the updates are incompatible and cause the graphics driver to do wonky things. In my case that came in the form of lost brightness settings.
I searched these forums for a fix and I could not find one, so now that I know the answer, I am sharing it here.
How do you fix it? You have to reinstall the graphics driver. This is how I did it.
I found the graphics driver install file that was already on my computer and I ran it. It reinstalled the driver in about 5 seconds and my screen brightness functionality was restored.
Where is my graphics driver install file? On my computer it is here:
D:driversVGAIntelx649.17.10.2932\Setup.exe
Yours is probably in a different but similar location depending on how it was installed and what brand it is, etc. I have a Lenovo
P400 touchscreen laptop with an Intel HD 4000 Graphics.

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