System Error, Update Client, Code 0x800f0991, Version 24H2 x64-bit (KB5053598)

Question

System Error, Update Client, Code 0x800f0991, Version 24H2 x64-bit (KB5053598)

shaun mann 0

System

Provider [Name] Microsoft-Windows-WindowsUpdateClient [Guid] {945a8954-c147-4acd-923f-40c45405a658} EventID 20 Version 1 Level 2 Task 1 Opcode 13 Keywords 0x8000000000000028
TimeCreated [SystemTime] 2025-03-23T22:16:49 EventRecordID 98752 Correlation
Execution [ProcessID] 2732 [ThreadID] 5540 Channel System
Security [UserID] S-1-5-18

EventData errorCode 0x800f0991 updateTitle 2025-03 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5053598) updateGuid {cf029d0a-8a20-4e41-9e48-7fe00436e2fa} updateRevisionNumber 1 serviceGuid {8b24b027-1dee-babb-9a95-3517dfb9c552}

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deepak patel 0 Reputation points

2025-05-23T05:58:05.4833333+00:00

in my company many device getting same issue - done all troubleshooting mention on internet but not help. its hard to reset many system in corporate

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deepak patel 0 Reputation points

2025-05-23T05:58:05.4833333+00:00

in my company many device getting same issue - done all troubleshooting mention on internet but not help. its hard to reset many system in corporate

Answer 1

Hi,

The error code 0x800f0991 often relates to issues with updating system components. This could be because of corrupted files, missing dependencies, or conflicts with other software. You can try the following steps to resolve this issue:

Use the Built-in Windows Update Troubleshooter

Windows includes a built-in troubleshooter that can automatically detect and fix common problems with Windows Update. You can access it through Settings > Update & Security > Troubleshoot > Additional troubleshooters.

Reset Windows Update Components

Resetting Windows Update components involves stopping related services and renaming certain folders so they can be recreated by the system:

Open Command Prompt as Administrator.
Stop the following services: wuauserv, bits, cryptsvc, and msiserver.
Rename the SoftwareDistribution and catroot directories.
Restart the services you stopped earlier.

Run System File Checker (SFC) and Deployment Imaging Service and Management Tool (DISM)

These tools help repair corrupted system files:

Open Command Prompt as Administrator and run sfc /scannow to scan for and attempt to repair corrupt system files.
Follow up with DISM commands to restore health of the system image:

DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

Manually Download and Install the Update

If automatic updates fail, consider downloading the update package manually from the Microsoft Update Catalog. Ensure you download the correct version matching your system architecture.

https://www.catalog.update.microsoft.com/Search.aspx?q=KB5053598

Best Regards,

Ian Xue

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shaun mann 0 Reputation points

2025-03-24T08:55:20.38+00:00

Hello thanks for getting back to me.

Followed each of the steps you provided and it has not fixed the problem.

Windows Update is still failing/installation
Hans de Ruiter 15 Reputation points

2025-05-23T06:21:42.4833333+00:00

@shaun mann Too late I know. Maybe a tip if you encounter the problem in the future again;

If everything fails:- Disable Windows Update. 1st setting: off, say that it may try it again over a week.- Download the Win 11 ISO (version 26100.1742, first release) See; https://www.microsoft.com/en-us/software-download/windows11 Mount the ISO and press setup.exe. (Don't boot from the ISO!) You start an In-Place install. Turn on the first screen by pressing in the top link: Disable searching for updates (not needed at this moment. A search takes longer to install.)

Only the Windows files are getting installed, your personal data is left alone.

When finished. Reboot. Start a cmd box as admin. Do a check and maybe a repair first! by "sfc /scannow" and "Dism /Online /Cleanup-Image /RestoreHealth" Make sure that your system files and the ComponentStore are without errors. It may find some error but both commands will fix that. If one or both command gave errors and fixed it; run that command again to make sure that everything is repaired.

Enable Windows Update and search and start the update(s).

Sound strange but I have spent many hours trying to fix the problem. Repaired everything etc. Retried it and... failed! An In-Place installation is the only thing that can help you in this case! Did it several times. By this way your problem is fixed under 30 minutes. If you think "where is my system busy with?" There is a way to see what the CBS engine (active during sfc and dism commands and also with updating) is doing: Start powershell as admin. Enter this command: "Get-Content C:\Windows\Logs\CBS\CBS.log -tail 10 -wait" If you think the update etc. is stuck... It's in reality quite busy. You can monitor the CBS progress at any moment.

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System Error, Update Client, Code 0x800f0991, Version 24H2 x64-bit (KB5053598)

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