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Discussion Starter #1
I have experienced something unusual that I cannot explain.

Let me start by saying that YES I know that secure boot is not designed to run on win 7.

I had been running win 7 in UEFI, secure boot enabled and CSM enabled and everything was going just fine for me. Until I needed to reinstall the OS. I left all my BIOS settings as they were. I installed windows from dvd selecting the UEFI option for my dvd drive. This all worked fine, windows installed, I got my drivers on, got some windows updates done without any issue so I didn't think I would encounter any trouble, then after one of my reboots, I don't remember what I was doing at the time, I got the little red box, secure boot violation or whatever it is, just telling me it wasn't happy. I went into BIOS and disabled secure boot, set the legacy drivers to load before UEFI drivers and windows is fine, although it is definitely slower.

What caused this? Is there something I can do to get UEFI working again ?

If it matters, my OS is installed onto a samsung 840 pro SSD 256gb (sata3)
 

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Discussion Starter #2
Nevermind, I found out its due to the windows update KB3133977 that prevents it from working. Doing a fresh install and hiding this update will be a cure. I shall be back later to report on my findings.
 

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Discussion Starter #3
I forgot to come back and check this but I was indeed correct. It was the mentioned update that broke secure boot
 
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