Troubleshoot Windows Update installation Error 0x800F0831

Updated 2026-04-22 · CC-BY-4.0 (MicrosoftDocs/SupportArticles-docs, repo license verified 2026-10-09) · retrieved 2026-10-09 · original

CBS_E_STORE_CORRUPTION

Troubleshoot Windows Update installation error 0x800F0831 (CBS_E_STORE_CORRUPTION)

Windows Update error 0x800F0831 (CBS_E_STORE_CORRUPTION) indicates that the Windows component store is corrupted. This condition prevents updates from installing correctly. This error typically occurs if a required package is missing from the store or isn't fully applied to the registry.

Use this article to identify the cause of the error and apply the appropriate fix for your environment.

Symptoms

When you try to install any update by using the standalone installer (.msu), or you try to install a Windows update, you receive one of the following error messages:

Some updates were not installed

(Screenshot in the original article: Screenshot of the installation error message.)

Updates failed

(Screenshot in the original article: Screenshot of the Windows Update failed error message.)

Note
The symptoms might vary depending on each case, but the cause of this issue remains the same.

Cause

This error can occur for one of the following reasons:

The update was never installed.
The update is installed, but some packages aren't applied to the registry.

To locate the installation packages in the system, search for the following registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\Packages

To investigate the cause further, examine the CBS.log file (C:\windows\logs\CBS). For more information about how to collect the CBS.log file, see Fix Windows Update corruptions and installation failures. Search for output that resembles the following example:

Info CBS Store corruption, manifest missing for package: Package_123_for_KB3192392~31bf3856ad364e35~amd64~~6.3.1.4

Error CBS Failed to resolve package 'Package_123_for_KB3192392~31bf3856ad364e35~amd64~~6.3.1.4' [HRESULT = 0x800f0831 - CBS_E_STORE_CORRUPTION]

Info CBS Mark store corruption flag because of package: Package_123_for_KB3192392~31bf3856ad364e35~amd64~~6.3.1.4. [HRESULT = 0x800f0831 - CBS_E_STORE_CORRUPTION]

Info CBS Failed to resolve package [HRESULT = 0x800f0831 - CBS_E_STORE_CORRUPTION]

Note
For more information about how to collect more update logs by using the TroubleshootingScript (TSS) tool version 2, see Introduction to TroubleShootingScript toolset (TSS).

Resolutions

Important
Before you troubleshoot this issue, back up the operating system disk. For information about this process for virtual machines (VMs), see About Azure Virtual Machine restore.

The appropriate method to fix this issue depends on the type of computer that's affected:

If the affected computer is an Azure VM, perform an in-place upgrade.
If the affected computer is a physical computer (or a VM in a non-Azure environment), remove and then reinstall the update.

Resolution for Azure virtual machines: Perform an in-place upgrade

If the affected computer is a VM that's running in Azure, we strongly suggest that you perform an in-place upgrade (IPU) to fix the issue. The in-place upgrade reinstalls the operating system while retaining the VMs current configuration.

For more information, see In-place upgrade for supported VMs running Windows in Azure.

Resolutions for physical computers

For physical computers or non-Azure VMs, follow these steps to obtain a fresh copy of the update, uninstall the update (if it's partially installed), and then reinstall the update.

Step 1: Obtain a fresh copy of the update

To make sure that CBS.log contains the latest data, reproduce the issue by trying to install the affected update or feature.
Review CBS.log to identify the update or feature package by its KB number.
Navigate to Microsoft Update Catalog, and search for the KB number that you identified.
For that KB number, select the package that's appropriate for the operating system version and architecture of the affected computer.
Download the package to a temporary folder ("temp") on drive C of the affected computer.
On the affected computer, open an administrative Command Prompt window, and then run the following commands, in sequence:
```
cd \
cd temp
expand -F:* <PackageName>.msu C:\temp
```
Note
In these commands, <PackageName> represents the file name of the package that you downloaded. The name contains operating system, architecture, and KB information (for example, windows10.0-kb4462937-x64_9e250691ae6d00cdf677707e83435a612c3264ea.msu).
Review the expanded contents of the package, and locate the .cab file that matches your operating system version (for example, windows 10.0-KB4462937-x64.cab).

Step 2: Remove the update (if it's necessary)

Follow this step if the update appears to be partly or completely installed on the affected computer.

At the command prompt, run the following command:
```
Dism /online /remove-package /packagepath:C:\temp\<CabFileName>.cab
```
Note
In this command, <CabFileName> represents the name of the .cab file.
If you're prompted to, restart the computer.

Step 3: Install the update

At the command prompt, run the following command:

Dism /online /add-package /packagepath:C:\temp\<CabFileName>.cab

Restart the computer.
Try again to install the update or feature.