How to resolve Windows Vista Update error 800B0100

April 26, 2022 / By

If you’ve tried to install recommended updates in Windows Vista, and receive error 800B0100, this tutorial offers the most common solution to that problem.

windows vista update error 800B0100

  1. The solution, in a nutshell, is to disable your firewall. If you’re using McAfee Personal Firewall Plus, F-Secure Internet Security, Norton Internet Security or another Firewall vendor, see its respective support page for assistance in disabling it (temporarily). If you’re using the built-in Vista Firewall, keep reading.
  2. Open the Control Panel and select Security.

    3. windows vista control panel
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  3. Select Turn Windows Firewall on or off.

    4. windows vista control panel security section
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  4. Select Off (not recommended), click Apply and then OK.

    5. windows vista firewall disabled
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  5. Back at the Windows Update screen, click the Try again button.

    6. windows vista update retry
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  6. The download(s) and installation should start…

    7. windows vista update manager
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  7. and this time successfully install. If a restart is required, make sure to re-enable your Firewall once your PC restarts.

    8. windows vista update manager successfully updated
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