Windows 10: Dual-Boot 10 and 7,... 7 won't boot

Do you have a System Image backup or a Restore Point from before KB3133977 was installed ?

 

I do have restore points, but I will still have Secure Boot turned on in BIOS and can't turn it off.

 

If i understand correctly,
SecureBoot was never turned on in BIOS until you installed KB3133977.
Now you can't turn it off because of a BIOS bug.

If that's true, a BIOS reset might turn it off when resetting to factory defaults.
That would also undo any changes you made to UEFI/BIOS so you would have to re-apply your tweaks.

If you can save your current configuration, i would do that before resetting.
Make sure you know all your current settings before doing a reset.

With your setup a bios reset could affect other OS's, i don't know, just a warning.

When you built the PC, did you start with a bios reset ?
I always start with a reset, no telling what the settings might be from the factory.

 

I did update the BIOS after the build. No bug in the BIOS . This version of UEFI Utility is just different.
I talked with ASUS today and they said this board does not have the option to turn Secure Boot off. I said, "I know, I've been trying for over a week". They said to reinstall Win7 on that SSD. They also said to call MS for a possible fix.
I think I will disconnect my other drives and try to do a system repair or a soft restore. I don't want to lose what I have on that drive, but I can back it all up and do a complete reinstall. No biggie, I use to reinstall Win Me every 6 months and reconfigure it to keep it lean and mean. I was always messing with Win XP, lots of tweaks in that one. Win7 has just been like, install it and use it. Never had a single problem with it. Just hate to do it in the summer, more important things outside to do.