How To Fix Error 800B0100 on Windows Update

Windows Update Error 800B0100

If you receive the Windows Update error 800b0100, it means that a file needed by Windows Update is not registered with Windows correctly. The System Update Readiness Tool can correct some conditions that cause this error. To use the tool, follow these steps:

1. Go to the System Update Readiness Tool webpage. In the Information for advanced users section, find the version of Windows and system type of your computer, and then click the link to download the System Update Readiness Tool. If you don't know which version of Windows you have, see View your computer information.
2. Run Windows Update again.
   

   Note

   Typically, the scan takes 15 minutes or less, but it can take longer on some computers. The Windows Update progress bar is not 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 should not cancel the update.

If the problem persists after you take these steps, go to the Microsoft Update Solution Center website to find more information about the error code or to request support by e‑mail.

Error codes this applies to:

• WindowsUpdate_800B0100
• 0x800B0100

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