Registry Editor Problem

If you want to contiinue repair steps from the booted media go back to my first post and resume with Step 3.

If you want to save time I'd skip to Step 6 to try a deep clean Reset with cloud option.

If that fails move on to Step 7 to do the Clean Install.

If you have files to register start with Step 8 to use the bootable media Command Prompt to copy your files out to another hard drive or external, a flash stick or to the a partition you can create on the other half of the flash stick which only formats the first 32gb for the installation media.

F12 like you said, brings up Startup Device Menu

I scrolled down to USB HDD: JetFlashTrancend 64GB

Selected UEFI: JetFalshTranscend 64GB

Enter

It looked like it rebooted, and then showed the following, and I went from the to Command Prompt.

How are you getting into the registry from Repair Mode or bootable media without mounting it? Are you in Safe Mode or Windows?

You may decide you want to cut your losses, use the tutorial to Rescue your files if you have any that are not backed up, then take this opportunity to do a gold standard Clean Install which compiles the best possible Install of Windows which will stay that way as long as you stick with the tools and methods given, has zero reported problems, and is better than any amount of money could buy: http://answers.microsoft.com/en-us/windows/wiki.... Read over it first, take notes, ask back any questions so you're prepared.

To create bootable Windows 10 Installation Media (on another PC if necessary) install Media Creation tool and follow the steps toward the bottom of the download page here in the section "Using the tool to create installation media:"

https://www.microsoft.com/en-US/software-downlo...

Insert media, boot it by powering up PC while pressing the BIOS Boot Menu Key for your PC maker given in this chart: https://www.sysnative.com/forums/hardware-tutor...

If the media won't boot you may need to enter BIOS/UEFI Setup (pressing key given in chart in link above) to turn off Fast Boot or Fast Startup first.

Choose the boot device as a UEFI device if offered, then on second screen choose Install Now, then Custom Install, then at the drive selection screen delete all partitions down to Unallocated Space to get it cleanest, select the Unallocated Space, click Next to let it create and format the needed partitions and start install - this makes it foolproof.

There is a step to rescue your files first using the booted media if you don't have them backed up: http://answers.microsoft.com/en-us/windows/wiki...

I'd also read through the Clean install tutorial to see if there's any other files you need to retrieve using that method above like Appdata for certain apps or games that you don't want to lose progress on. The most important are covered in the tutorial, you can research where the others you need are located.

You will get and keep the best possible install to the exact extent you stick with the steps, tools and methods in the linked tutorial. It's a great learning experience that will make you the master of your PC because you will learn everything that works best and how to apply it with your own hands.

Feel free to ask back any questions. Report back results for more steps if necessary.

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