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Update troubleshoot-windows-update-error-0x8000ffff.md
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support/windows-server/installing-updates-features-roles/troubleshoot-windows-update-error-0x8000ffff.md

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title: Troubleshoot Windows Update Error 0x8000FFFF
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description: Learn how to resolve the Windows update installation error 0x8000FFFF on Windows.
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description: Learn how to resolve Windows Update installation error 0x8000FFFF on Windows.
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manager: dcscontentpm
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audience: itpro
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ms.date: 11/6/2025
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## Summary
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You encounter the error code 0x8000FFFF during a Windows Update installation. This error is usually related to `CryptCATAdminAddCatalog`.
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During a Windows Update installation, you receive error code 0x8000FFFF. This error is usually related to the`CryptCATAdminAddCatalog` function.
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## Prerequisites
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For virtual machines (VMs) running Windows in Azure, make sure that you back up the OS disk. For more information, see [About Azure Virtual Machine restore](/azure/backup/about-azure-vm-restore).
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For Microsoft Azure virtual machines (VMs) that are running Windows, make sure that you back up the OS disk. For more information, see [About Azure Virtual Machine restore](/azure/backup/about-azure-vm-restore).
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## How to identify the issue
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This error is visible in the `Event Setup` and `CBS` logs following a failed update.
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This error is visible in the `Event Setup` and `CBS` logs after a failed update occurs.
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:::image type="content" source="./media/troubleshoot-windows-update-error-0x8000ffff/0x8000ffff-1.png" alt-text="Example of Windows Update error 0x8000FFFF in the Event Setup log" lightbox="media/troubleshoot-windows-update-error-0x8000ffff/0x8000ffff-1.png":::
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Although this error occurs without store corruption, it usually indicates corruption in *C:\Windows\System32\catroot2*.
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## Root cause
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## Cause
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This is considered an unexpected error, usually seen as a catastrophic failure. It's related to the `CryptCATAdminAddCatalog` process that can be affected by corruption in the system files or directories, like the *catroot2* folder.
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This error is generally unexpected, and is usually considered to indicate a catastrophic failure. The `CryptCATAdminAddCatalog` process can be affected by corruption in the system files or folders, such as the *catroot2* folder.
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## Resolution
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For Windows-based computers, perform an [in-place upgrade](/windows-server/get-started/perform-in-place-upgrade#perform-the-in-place-upgrade).
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For VMs running Windows in Azure, see [in-place upgrade on the Windows virtual machine](/azure/virtual-machines/windows-in-place-upgrade).
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For VMs that are running Windows in Azure, see [in-place upgrade on the Windows virtual machine](/azure/virtual-machines/windows-in-place-upgrade).

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