◆Error Codes Wiki

Windows Error 0x800F081F — Source Files Not Found

Errorupdate

Overview

Windows Update error 0x800F081F means the source files for enabling a feature or installing an update could not be found.

Key Details

  • CBS_E_SOURCE_MISSING — required source files not found
  • Common when enabling .NET Framework 3.5
  • Also occurs with optional Windows features
  • May need Windows installation media to resolve

Common Causes

  • Group Policy blocking Windows Update as repair source
  • Windows installation media not available
  • Corrupted component store
  • WSUS server not providing required files

Steps

  1. 1Enable "Contact Windows Update directly" in Group Policy
  2. 2Use Windows ISO/USB: DISM /Online /Enable-Feature /FeatureName:NetFx3 /Source:D:\sources\sxs
  3. 3Run DISM /Online /Cleanup-Image /RestoreHealth
  4. 4Check WSUS settings in enterprise environments

Tags

windowsupdatesource files not foundwindows-errorfix

More in Update

windows-80070002-file-not-foundWindows Error 0x80070002 — File Not Found
Warning
windows-80070005-access-deniedWindows Error 0x80070005 — Access Denied
Error
windows-80070057-invalid-parameterWindows Error 0x80070057 — Invalid Parameter
Warning
windows-80072EE7-server-connection-failedWindows Error 0x80072EE7 — Server Connection Failed
Warning
windows-80073712-component-store-corruptedWindows Error 0x80073712 — Component Store Corrupted
Error
windows-80070070-insufficient-disk-spaceWindows Error 0x80070070 — Insufficient Disk Space
Warning

Frequently Asked Questions

Windows needs source files from installation media or Windows Update, and one or both are blocked.