Windows & BSOD · medium

How to fixWU-0x80240020

Windows Update Error 0x80240020

What this error means

Windows Update Error 0x80240020 ranks as a medium-severity Windows operating system issue in our database. The update installation was blocked or failed to trigger, typically due to upgrade registry locks or incomplete session parameters in the update database. Work through the steps below in order.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Stop Windows Update services, delete download cache files, and trigger a manual update scan.

Stop Windows Update services, delete download cache files, and trigger a manual update scan..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Create or modify the AllowOSUpgrade registry key to force Windows upgrade paths.

Create or modify the AllowOSUpgrade registry key to force Windows upgrade paths..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Run the Windows Update Troubleshooter to clear registry lock flags.

Run the Windows Update Troubleshooter to clear registry lock flags..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Active registry parameters restricting or delaying Windows OS updates.
  • Incomplete download sessions leaving corrupt metadata tags in the SoftwareDistribution folder.
  • Conflicting background installation services locking the update database.