Fix: Error Code 0x8007007f in Windows 11 Installation Assistant

After the official release of Windows 11 on October 5, 2021, some users have encountered a problem while upgrading their PC to Windows 11 using the Windows 11 Installation Assistant. The upgrade fails due to the error “Error code 0x8007007f”. It usually occurs at around 71% through the installation. Windows 11 has just been released, it is quite normal to see this type of Errors for users who want to upgrade their PC.

The message shows “Something went wrong. Select Try again, and if that doesn’t work, contact Microsoft for help. Error Code 0x8007007f”. The error could be related to not enough system storage or insufficient permissions of the installation assistant. Currently, we don’t have any detailed official information about the “error code 0x8007007f” that occurs when installing Windows 11.

0x8007007f Error Code

How to Fix 0x8007007f Error Code in Windows 11

Method 1: Restart Windows

One of the solutions to fix the error is to restart Windows once. It can be fixed by just restarting even though you did not do anything in particular, so for the time being this “Restarting Windows” is one of the most powerful solutions.

Method 2: Run Windows 11 Installation Assistant as an Admin

  • Right-click on Windows 11 Installation Assistant.
  • From the drop-down menu, you have to choose the Run as administrator option. If you see a follow-up UAC dialog box, click Yes.
  • Now proceed for Upgrade with the installation assistant and see if the error still appears.

Method 3: Enable UAC

If User Account Control has been disabled in Windows 11, then running the Assistant as Administrator may not work. In this case, you need to enable UAC, and here’s how to do it:

  • Press the Win + R button combination and enter UserAccountControlSettings
  • Make sure the slider is at the third level from the bottom
  • Run the assistant as an admin, as mentioned in method 2

Method 4: Free up disk space

If there is not enough space on the system partition for downloaded files through the assistant, then the error code 0x8007007f may also appear. In this case, clean the system partition from unnecessary files and try to repeat the Windows 11 installation procedure.

Method 5: Scanning SFC and DISM

If the system files are damaged, then it can cause error code 0x8007007f. We will automatically restore the system files. To do this, press Win + X and select Windows Terminal (Administrator) and enter the below two commands in turn, pressing Enter after each, and waiting for the end of the process.

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

You may also see another error message as follows

“Ox8COF0830 – ox2W03 The installation failed in the SAFE_OS phase with an error during INSTALL_UPDATES operation,”

This issue could be related to drivers, and as of now, a proper workaround is not available.

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