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error-solutions

Last Update 20 hours ago

Fix ERROR_FILE_NOT_FOUND error message in a few easy steps Install Error 0x800f081f: What CBS_E_SOURCE_MISSING Means and How to Fix It in 2026 Windows Update Failed? Fix Error Code 0x800F0922 Easily

Install Error 0x800f081f: What CBS_E_SOURCE_MISSING Means and How to Fix It in 2026

file-not-found

Last Update 3 days ago



Your Windows install stops with error 0x800f081f, also called CBS_E_SOURCE_MISSING. This guide fixes it by pointing Windows to a local source, using a Windows ISO file.


CBS_E_SOURCE_MISSING means Windows could not find the source files needed to install a feature or update, so it throws error 0x800f081f. The fix is to mount a Windows ISO of the same version, then run the DISM command with the ISO's sources folder as the source. Windows then installs from your local copy.



Steps

  1. Download a Windows ISO that matches your installed version and double-click it to mount it.

  2. Note the drive letter of the mounted ISO, for example D:.

  3. Open Command Prompt using Run as administrator.

  4. Run DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs.

  5. Replace D: with your own drive letter if it is different.

  6. Wait for the message that the operation completed successfully.

  7. Restart your PC and retry the update or feature.



  • CBS stands for Component-Based Servicing, the part of Windows that installs updates and optional features.

  • The ISO must match your Windows version and language, or the files will not be accepted.

  • The /LimitAccess option tells Windows to use your local source instead of Windows Update.

  • On Windows Pro, a Group Policy setting named "Specify settings for optional component installation" can also fix this error.


 Common Problems 


  • "The source files could not be found" again: Check the drive letter and make sure the path ends in \sources\sxs.

  • ISO version does not match: Download the ISO again using the same Windows version and language you have installed.

  • Group Policy option is missing: It is only in Pro and Enterprise, so use the DISM command on Windows Home.



 FAQs 



Is CBS_E_SOURCE_MISSING the same as 0x800f081f?
Yes. One is the error name and the other is its code.

Do I need a USB drive?
No. A mounted ISO file works just as well.

Will this delete my data?
No. It only installs the missing feature or update files.


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