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How to Fix the Error 0xc1420121 When Installing a Feature Update

How to Fix Error 0xc1420121 When Installing a Feature Update

Updating Windows is one of the best ways to keep your system free from issues. However, updating Windows is not always a straightforward process, as you might face different issues while downloading them. One such issue is the error 0xc1420121 that appears on installing a feature update.

As such, if you’re facing error 0xc1420121 on installing a feature update, then try the solution in this guide to troubleshoot the problem for good.

What Causes the Error 0xc1420121?

The error 0xc1420121 usually appears if the wimmout.sys driver or its registration, which is responsible for the mounting of the WIM files, is missing from your computer. The error appears with the following description:

The image could not be mounted because the wimmount.sys driver is not installed on this machine.

To confirm the unavailability of the wimmount.sys driver or its registration is causing the issue, execute the following command in the elevated Command Prompt windows.

sc.exe qc WimMount & sc.exe query WimMount

dir C:\windows\system32\drivers\wimmount.sys

net start wimmount

If you get the “The specified service does not exist as an installed service” message, then it means your computer lacks the wimmount.sys driver or its registration.

Fixing the Error 0xc1420121 on Window

You can fix the error 0xc1420121 by following the below instructions:

  1. Open the Registry Editor and navigate to the following location:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WIMMount
  2. Double-click the ImagePath string in the right pane.
  3. Change Value data to the following entry and click OK.
    system32\drivers\wimmount.sys

ImagePath String in the Registry Editor

If the WIMMount key is missing, download the wimmount reg file. After that, double-click the wimmount reg file and click Yes to the UAC that appears.

Then, click Yes to the confirmation box that crops up.

Confirmation box to Fix error 0xc1420121

Click OK.

OK option in reg file

That’s about it. After that, restart your computer, and you’ll see that the error 0xc1420121 is gone.

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