How to fix that I can't install 2025-07 Cumulative Update for NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 for x64 (KB5056580) error code-x800700c1

The core servicing modules seem to be corrupt. Please use my SSU diagnostics VBScript (SSUDiag.vbs) to narrow down the issue.

• Right-click SSUDiag.vbs and choose "Save link as" in your browser.
• Save it to the desktop. Double-click the script to run it.
• It outputs a log file. Share it on OneDrive or gofile.io and post the download link here.

Note: The script does not modify anything on your system and does not require administrative rights.

Hello, Nehal Raj Motwani

Thank you for your feedback. I understand that you are experiencing issues with the update. Here are some troubleshooting solutions:

1. Search for CMD in the search bar, select Run as administrator, and enter the following commands one by one:

net stop bits

net stop wuauserv

net stop cryptsvc

ren %systemroot%\SoftwareDistribution SoftwareDistribution.old

ren %systemroot%\System32\catroot2 catroot2.old

Del “%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr*.dat”

net start bits

net start wuauserv

net start cryptsvc

Restart your computer after completing the above steps.

2. If you are unable to install a specific update, you can use the DISM command to install it:

First, download the problematic update from the following website:

Microsoft Update Catalog

Place the downloaded “.msu” package in an easily accessible path.

For example: “C:\update\”

Open the command prompt with administrator privileges.

Click the “Windows Logo Key” to open the search bar -> Type “cmd” in the search bar and open it with administrator privileges.

First, expand the “.msu” package:

expand -F:* C:\update\**KB package** C:\update\

Note: Replace KB package with the name of the local KB package. Generally, pressing Tab will automatically search for files in the update folder and complete the code. You can also manually copy the filename and replace it.

Then install the extracted KB package using DISM:

dism.exe /online /Add-Package /PackagePath:C:\update\**extracted “.cab” file**

3. Attempt an in-place upgrade.

This will refresh your Windows without deleting your data, but it is still recommended to back up important data.

Download Windows 11

Download the Windows 11 ISO from this website. Then follow the instructions to select “Keep personal files.”

I look forward to your feedback.

Best Regards, 

Kai Ho | Microsoft Q&A Support Specialist

Hi Nehal,

Please download Farbar Recovery Scan Tool 64-bit (FRST64.exe)

https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/

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.

• Download fixlist.txt
• Save Fixlist.txt to the same folder as FRST64.exe.
• Close all programs.
• Launch the Farbar Scanner tool and click "Fix".
• Restart Windows when prompted.
• Upload the output log file (FixLog.txt) to OneDrive or GoFile.io.

NOTE: The fixlist.txt script was written specifically for this user and for use on that particular machine. It is not recommended to run it on another machine, and don't run the same fixlist.txt more than once.