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Get it to start (Windows 10 fails to start in 'default mode' but not others) and run Windows 10 Repair Install<br />
<br />
<a href="https://www.microsoft.com/en-us/software-download/windows10" rel="ugc">https://www.microsoft.com/en-us/software-download/windows10</a><br />
<br />
Windows 10 is running, so click on the Download button (not Upgrade Button, select Save.<br />
Create a USB Windows Installation key and then run Setup on the USB Key. <br />
This will launch the Repair and proceed normally.<br />
<br />
Try the option Keep Everything. &nbsp;If that does not work you may need to reinstall Windows.
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Get it to start (Windows 10 fails to start in 'default mode' but not others) and run Windows 10 Repair Install

https://www.microsoft.com/en-us/software-download/windows10 [https://www.microsoft.com/en-us/software-download/windows10]

Windows 10 is running, so click on the Download button (not Upgrade Button, select Save.
Create a USB Windows Installation key and then run Setup on the USB Key.
This will launch the Repair and proceed normally.

Try the option Keep Everything.  If that does not work you may need to reinstall Windows.

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Will this also work in this case where Windows 10 is running as a virtual machine on a server?
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Will this also work in this case where Windows 10 is running as a virtual machine on a server?

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It should work on any running Windows 10 machine. It needs an Internet Connection.
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It should work on any running Windows 10 machine. It needs an Internet Connection.

But I can't just run it from a USB key if it's a VM ... ?

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Can you enable USB mode on the VM. &nbsp;You just need to run Setup on the USB key. You can use that link above (Media Creation Link) to create the USB on a different computer. &nbsp;There is a an option to do that. <br />
<br />
Once made, run Setup on the USB Key on the Windows 10 VM.
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Can you enable USB mode on the VM.  You just need to run Setup on the USB key. You can use that link above (Media Creation Link) to create the USB on a different computer.  There is a an option to do that.

Once made, run Setup on the USB Key on the Windows 10 VM.

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Ok, I'll check that. Or may boot from an ISO? The MS tool allows me to create an ISO.
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Ok, I'll check that. Or may boot from an ISO? The MS tool allows me to create an ISO.

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Ok, so I've noticed that the VM was still using Windows 10 (v.1509). I've upgraded it to v.1809 now (using the standalone upgrade thingie) &nbsp;and everything works fine again!
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Ok, so I've noticed that the VM was still using Windows 10 (v.1509). I've upgraded it to v.1809 now (using the standalone upgrade thingie)  and everything works fine again!

Xeronimo

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<div class="content wysiwyg-content">
Hi, <br />
<br />
Weird problem here. I've got a Windows 10 VM that used to work. But now it always fails with an 0xc000021a error. I tried to google a solution but I have failed so far :(<br />
<br />
I've tried running sfc /scannow as well as Dism /Online /Cleanup-Image /RestoreHealth (after having successfully booted in Windows 10 by using 'disable driver signature enforcement' in the 'startup settings' of the troubleshoot menu.<br />
<br />
Any other ideas? Thanks!
</div>
</div>


Hi, 

Weird problem here. I've got a Windows 10 VM that used to work. But now it always fails with an 0xc000021a error. I tried to google a solution but I have failed so far :(

I've tried running sfc /scannow as well as Dism /Online /Cleanup-Image /RestoreHealth (after having successfully booted in Windows 10 by using 'disable driver signature enforcement' in the 'startup settings' of the troubleshoot menu.

Any other ideas? Thanks!

Windows 10 fails to start in 'default mode' but not others

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.