Error Code 0x800700c1 when installing Windows 11

Question

Error Code 0x800700c1 when installing Windows 11

DJ Farrar 0

Error Code 0x800700c1 when installing Windows 11.

I get the same error code on the following also pending updates:

Feature update to Windows 10, version 22H2
2025-07 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2 for x64 (KB5062154)
2024-01 Update for Windows 10 Version 22H2 for x64-based Systems (KB5033052)
Microsoft .NET Framework 4.8.1 for Windows 10 Version 22H2 for x64 (KB5011048)

The first of these is confusing to me as winver says I am already on Windows version 22H2.

How can I fix the issue and update to Windows 11, preferably without a completely fresh install?

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Answer 1

Ramesh Srinivasan 164.5K Volunteer Moderator

Please run the fix below. It replaces the corrupt modules with good copies, sourced from my GitHub page.

Download Farbar Recovery Scan Tool 64-bit. FRST64.exe
Download fixlist.txt
Save Fixlist.txt to the same folder as FRST64.exe.
Close all programs.
Launch the Farbar Scanner tool (FRST64.exe) and click "Fix".
Restart Windows when prompted.
Upload the output log file (FixLog.txt) to your OneDrive.
After restarting Windows, run "DISM /Online /Cleanup-Image /RestoreHealth" and post the output.

Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears. See this screenshot. It's a safe tool used in most antimalware forums.

DJ Farrar 0 Reputation points

2025-08-12T09:18:38.0833333+00:00

Error: 0x800f081f

The source files could not be found.

Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see https://go.microsoft.com/fwlink/?LinkId=243077.

The DISM log file can be found at https://1drv.ms/f/c/c5363c46bda1678e/Eu2X7M3OklNFr70CflTSMX4BCQfOnHJ_68i6TOb3L5UcCQ?e=KwyUuq

Fix Log: https://1drv.ms/f/c/c5363c46bda1678e/Ej_kRCwPIR1OvADmhKm3bT8BWVCngB65CZss9vcAM37Ujw?e=WzLBTO
Ramesh Srinivasan 164.5K Reputation points Volunteer Moderator

2025-08-12T09:27:14.07+00:00

My mistake. I mentioned the target folder name incorrectly.

Please redownload the (updated) fixlist.txt rerun it.

Post the latest Fixlog.txt.

(No need to rerun DISM.)

The fixlist should take care of 0x800700C1 error.
DJ Farrar 0 Reputation points

2025-08-12T09:32:29.08+00:00

Fixlog https://1drv.ms/f/c/c5363c46bda1678e/Ej_kRCwPIR1OvADmhKm3bT8BsAE7nNOmWUWPgqJNbTiqow?e=cyRRIg
DJ Farrar 0 Reputation points

2025-08-12T09:34:20.8666667+00:00

All updates seem to be working now, thank you for your help
Ramesh Srinivasan 164.5K Reputation points Volunteer Moderator

2025-08-12T09:35:48.86+00:00

Looks good. The 0x800700C1 error should be gone now.

See if you can install all available updates.

Note:

If you plan to upgrade to Windows 11, you can skip the updates shown on Windows Update. But I'd suggest updating the BIOS (since yours is slightly old) before initiating the Windows 11 upgrade.

Answer 2

Ramesh Srinivasan 164.5K Volunteer Moderator

Please upload your CBS logs to OneDrive or GoFile.io and share the link here. To collect the CBS logs, open admin PowerShell and run:

GCI -Path 'c:\windows\logs\cbs\*.log', 'c:\windows\logs\dism\dism.log' | Compress-Archive -destination (join-path ([environment]::GetFolderPath('Desktop')) \CBS.zip)

This creates a file named CBS.zip on your desktop. Share it on OneDrive or GoFile.io and post the link here.

DJ Farrar 0 Reputation points

2025-08-11T16:04:53.39+00:00

https://1drv.ms/f/c/c5363c46bda1678e/Esaw5rcBqjpLmW5QCPBGVIsB7Dmkh02vw7h7ryoighDTXw?e=cJPqwy
Ramesh Srinivasan 164.5K Reputation points Volunteer Moderator

2025-08-11T16:20:19.8166667+00:00
A core module is corrupt. DISM or repair installation won't work unless it's fixed. To verify, run this from admin Command Prompt.

dism /online /cleanup-image /restorehealth

You might encounter the error code "193". Post the output.

(A fix is on the way.)
DJ Farrar 0 Reputation points

2025-08-12T08:44:13.8133333+00:00

Error: 0x800f081f

The source files could not be found.

Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see https://go.microsoft.com/fwlink/?LinkId=243077.

The DISM log file can be found at https://1drv.ms/f/c/c5363c46bda1678e/Eu2X7M3OklNFr70CflTSMX4BAj2VTufLIMPlTNL10O2ziQ?e=EY4gf1

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Error Code 0x800700c1 when installing Windows 11

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