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

Go to What is the System Update Readiness Tool? on the Microsoft website.
Click the link for your version of Windows to download the System Update Readiness Tool. If you don't know which version of Windows you have, see View your computer information.
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 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 should not cancel the update.

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

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Applies to all editions of Windows Vista.

Windows Update Error 800B0100

Note