Windows 10 build 10074 upgrade from windows 7 - error: 0xc000021a

After downloading and verifying the ISO build 10074 still running into errors when trying to install windows 10 from boot-up for a dual boot installation.

The ISO disk is read for a little while and then displays the 0xc000021a error which just causes a boot-loop.

I'm greatly concerned with windows 10 not being too far from release that Microsoft has not spent enough time on the installation mechanism to resolve all possible update configurations. 

As per normal with MS error - no information is given on why I am getting the error as Windows 7 works with no issues. Secondly I am trying to install to a blank/formatted new drive (for dual boot) but I cannot even get that far as it seems to be trying to validate my current installation. 


 

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Last updated May 22, 2018 Views 1,810 Applies to:

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Best,
Andre
Windows Insider MVP
MVP-Windows and Devices for IT
twitter/adacosta
groovypost.com

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Hi,

I understand you get a error code 0xc000021a, when installing Windows 10 Technical Preview.

Sorry to hear about the inconvenience caused.

This error code is generally caused due to incompatible driver or hardware and Win logon files.

We would recommend you to create a bootable disk or USB and then try a clean install on the drive and check if it helps.

To create a bootable USB/DVD refer to the below link:

http://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool

Hope this information helps. 

Vinz

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Thanks for response BUT.... I used a DVD burnt from the latest build ISO which caused the issue. I am also trying to install to a new driver while keeping my old driver with windows 7. The new drive is a cleanly formatted drive ready and waiting for windows 10. 

I have never had the issue with older o/s upgrades as I have always dual booted previews with no issues in past - XP, Windows 7 and Windows 8.  

Both answers are unfortunately not going to work. How do I raise to the next level for assistance?

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Hi,

Thank you for the reply.

I would suggest you to disable all the hardware except mouse and keyboard and then try to boot and check if it helps.

To disable hardware device, open device manager and right click and select disable.

Keep us updated. 

Vinz

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Hi,

Thank you for the reply.

I would suggest you to disable all the hardware except mouse and keyboard and then try to boot and check if it helps.

To disable hardware device, open device manager and right click and select disable.

Keep us updated. 

Not sure how disabling hardware in windows is going to help when trying to install windows 10 from boot to a freshly formatted drive. The computer is booting into the o/s of the installation disk and never getting into regular windows?

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Could you describe your complete system specifications?

Best,
Andre
Windows Insider MVP
MVP-Windows and Devices for IT
twitter/adacosta
groovypost.com

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Could you describe your complete system specifications?

Desktop computer running with i7 960 CPU @ 3.2ghz (OC is turned off currently), 16GB RAM, two SSD (dual booting - 1 windows 7 64bit ultimate, other blank and ready for another OS previously windows 8), 1 TB data drive. HD5850 graphics card, two monitors, wirless AC adapater, Realtek audio, wired corsair keyboard and G700s mouse (mouse can run wireless but running wired currently).

Windows 7 ultimate at SP1 with all latest updates installed.

Motherboard is x58 pro-E

Memory is running in dual configuration rather than supported triple.

Apart from keyboard and mouse, no other peripherals are installed/attached.

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Guess no one is interested in resolving the problem?

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With those parameters, I would grab my build 10041 install disk and try installing it. If that works, I would freshly download the 10074 ISO and burn a new DVD to try.

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