Windows Update error 800B0100

If you receive Windows Update error 800B0100, it means that a file needed by Windows Update is corrupted or missing.

The System Update Readiness Tool can help fix problems that might prevent Windows updates from installing. Windows Update error 800B0100 is one of the problems that the tool can check for and repair. To learn how to use this tool, go to What is the System Update Readiness Tool? on the Windows website.


  • Typically, the scan will take 15 minutes or less, but it can take longer on some computers. The Windows Update progress bar isn't updated during the scan, and progress seems to stop at 60% complete for some time. This behavior is expected. The scan is still running, and you shouldn't cancel the update.

If the System Update Readiness Tool encounters problems while running, it records them in a file called CheckSUR.log, which is located in your Windows folder, under Logs\CBS\. On a default installation of Windows this will be C:\Windows\Logs\CBS.

If you continue to see this error, see this automatic troubleshooter on the Microsoft Support website, or go to the Microsoft Answers website for more assistance.

Error codes this applies to:

  • WindowsUpdate_800B0100

  • 0x800B0100

  • WindowsUpdate_dt000

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