Fixing HOSTFXR.dll Error on Windows 11

Question

How can the error message indicating that DOTNET\Host\8.0.12\HOSTFXR.dll is either not designed to run on Windows or contains an error be resolved when starting Windows 11 on a Dell XPS 8950? The error code shown is 0xc000012F.

Answer 1

Hello Peter S,

Thank you for posting in Q&A forum.

Error code 0xc000012F, typically indicates a problem with the .NET runtime or a corrupted DLL file. Here are some steps you can try:

1. Run System File Checker (SFC) and DISM:

sfc /scannow

DISM.exe /Online /Cleanup-image /Restorehealth

2. Reinstall the .NET Runtime:

• Go to the official .NET download page and download the latest version of the .NET runtime.

• Uninstall the existing .NET runtime from your system via Control Panel > Programs and Features.

• Install the newly downloaded .NET runtime and restart your computer.

3. Ensure your Windows 11 is up to date by going to Settings > Update & Security > Windows Update and checking for updates. Install any available updates and restart your computer.
4. If the error is specific to a particular application, try uninstalling and then reinstalling that application. Make sure to download the latest version from the official website.
5. Perform a clean boot to see if any third-party software is causing the issue. You can do this by:

• Pressing Win + R, typing msconfig, and pressing Enter.

• In the System Configuration window, go to the Services tab, check Hide all Microsoft services, and then click Disable all.

• Go to the Startup tab and click Open Task Manager. Disable all startup items.

• Restart your computer and see if the issue persists.

Reference：

[SOLVED] Error Status 0xc000012f. Bad Image problem with USP10.dll

I hope the information above is helpful.

If you have any questions or concerns, please feel free to let us know.

Best Regards,

Daisy Zhou

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