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Error 0x800F081F

How to Fix Windows Update Error 0x800F081F

Fix time: 20 mins Difficulty: Medium 0 views Updated: July 2026

Learn how to resolve Windows Update error code 0x800F081F (Source files could not be found) using DISM and SFC tools.

Symptoms

  • Update fails to install with error code 0x800F081F
  • Occurs frequently during .NET Framework 3.5 installations or cumulative updates
  • DISM commands fail stating source cannot be downloaded

Common Causes

  • Missing or corrupted Windows Component Store components
  • Blocked internet access to Windows Update servers for optional packages
  • Missing installation media path in Group Policy

Step-by-Step Solutions

Method 1: Run DISM Component Store Repair

The Deployment Image Servicing and Management (DISM) tool downloads missing system file payloads directly from Microsoft.

  1. Open Command Prompt as Administrator.
  2. Run the following command: 
    DISM /Online /Cleanup-Image /RestoreHealth
  3. Wait for the process to complete (this may take up to 20 minutes).
  4. Restart your computer and check for updates.

Method 2: Clean Up Component Store

Clean up and align the local component store to remove outdated registry references.

  1. Open Admin Command Prompt.
  2. Type this command and press Enter: 
    dism /online /cleanup-image /startcomponentcleanup
  3. Once complete, run System File Checker: 
    sfc /scannow

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Frequently Asked Questions

It means Windows Update requires components to install the update but cannot locate their backups in the local store or online server.
Usually no, the online repair download works automatically unless local network blockages exist.