If you receive Windows Update error 8024001b while trying to install updates, an update for Windows Update itself is being installed. Depending on how many programs are currently running and which operating system files or folders are affected while this update is being installed, it might take several minutes before you can install other updates for your computer. Try installing updates again later. For more information about updates, see Updates: frequently asked questions.
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: