INACCESSIBLE BOOT DEVICE after deleting upper and lower filter of the wrong device

Hi Andre

First and foremost: Thanks for your help!

I have found a way to fix my computer now.

Maybe this will be helpful to others.

I made a Windows to go USB stick and booted Windows from there. Like that I could access all my files and drives from my computer while being in Windows.

Knowing exactly which registry entry I broke by deleting two keys and knowing it was in the SYSTEM part of the registry, I navigated to the drive my broken Windows was located to Windows\System32\config, located in that folder is the SYSTEM registry hive along with all other registry hives.

So I opened regedit on my Windows to go and then loaded the broken SYSTEM registry hive in there. I navigated to where I deleted the two keys and re-created them with the names, values and types matching what they were when I deleted them (this part requires knowing what those values and types would be). All that was left to do now was unload the hive and reboot the system and tada. Everything back to normal as if I never broke anything.

So glad I didn't reset Windows.

Hope this helps other with similar issues.

With regards,

Sandro

Hi Sandro

My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.

	Power on and off your computer three times

How do you do that?

Power on, when you see the Windows Logo - power off

Power on, when you see the Windows Logo - power off

Power on, it will then your computer will boot into the Advanced Recovery environment

You might be asked to sign in with your Microsoft Account or Local Account password.

Click Advanced Options

Click Troubleshoot

Click Advanced Options

Click System Restore, see if you can go back to an earlier time.

If not, boot into the recovery environment again, then try performing a startup repair.

Perform the startup repair a couple more times then restart again to see if you are able to boot to the desktop successfully.

If that does not work, boot into the recovery environment, then click 'Go back to previous version of Windows'

If that does not work.

Power on and off your computer three times

On the third time, your computer will boot into the Advanced Recovery environment

Click Advanced Options

Click Troubleshoot

Click Reset this PC

Click Keep my files

Choose your account

Enter your password

Click Continue

Click Reset

If that does not work.

Go to a working computer, download, create a bootable copy, then perform a clean install.

	Step 1: How to download official Windows 10 ISO files 

	[http://answers.microsoft.com/en-us/windows/wiki...](http://answers.microsoft.com/en-us/windows/wiki/windows_10-windows_install/how-to-download-official-windows-10-iso-files/35cde7ec-5b6f-481c-a02d-dadf465df326)



	Step 2: How to: Perform a clean install of Windows 10

	[http://answers.microsoft.com/en-us/insider/wiki...](http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-do-a-clean-install-of-windows-10/aef0ae63-2117-41ee-a8ea-4a3181625b08)



If there are files on the drive you want to recover, see -  How to: Perform a Custom install of Windows 10

http://answers.microsoft.com/en-us/insider/wiki...

Step 4: how to recover your files from Windows.old:

https://answers.microsoft.com/en-us/windows/for...

Hi Andre

My main issue with resetting is not knowing which data I will lose since there is no official information about what is kept and what is removed.

I'd rather take my time to find a way to restore windows to an earlier point which would require me to fix the error I get there or maybe restore the registry file to its base state and maybe copy the file from another computer.

I was hoping to find someone who had the same or a similar issue and was able to fix it.

With regards,

Sandro

Hi Andre

My problem is no longer the cd drive not being detected but not being able to access/boot my pc.

While trying to get the cd drive to show up I broke my registry, I need help to be able to boot my pc again not the cd drive.

Best regards,

Sandro

Hi Schwifty_CH

My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.

What is the exact make and model?

Open Start, type: system information

Hit Enter

Click System summary

Look in the right pane

Copy the system sku info into reply here.

See example: https://imgur.com/qzektpA

You might need to update the BIOS and chipset drivers.

Press Windows key + X

Click Device Manager

Expand Universal Serial Bus controllers at the bottom

Right click each entry then click uninstall

Exit then restart

Windows 10 will then redetect them.

Check if they then work.

If not...

https://support.microsoft.com/en-us/help/17614/...