Attempting to repair the BCD ( Access denied).Here's what I tried initially that did NOT work (And made it worse): I became stuck with "The operating system couldn't be loaded because the system registry file is missing or contains errors.
I spent the day trying to fix it, but I couldn't find anything that worked. When I tried to boot up, it was stuck in a reboot loop where it would continually fail to repair itself. Yes, I backed up my important personal files. I asked for help on the Microsoft website, but it's all just a bunch of generic responses that don't actually address the problem, usually boiling down to "wipe your hard drive and start over with a new install." Ridiculous, and I'd rather spend half a week messing with the registry to try to fix this, than start over with everything. This, in turn, kills the critical process and you hit the BSOD. Every time you boot up, it tries to run the bad update, and breaks the SYSTEM registry file. I think that the root cause here is that a file besides SYSTEM (from the bad update) has taken hold somewhere else in the registry (or updater). This indicates to me that it is a small error in a badly tested update that was pushed too soon, and that it CAN be fixed somewhere in the registry. However, by replacing a few of my registry files (namely SYSTEM), I can get the computer to at least try to boot up before it hits the BSOD, and critical process dies. The issue at hand hasn't been addressed for me, and the way to "fix" it, according to Microsoft, is to completely re-install. It now hits BSOD with error "Critical Process Died" after a few seconds of loading. Long story short, I tried a bunch of things and it turns out that the registry got messed up by the update. After an update on the 16th/17th, my Windows 10 computer failed to boot.
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