Update KB4551762 Always Fails


I'm trying to install update KB4551762 but for some reason it keeps failing. It always installs 20% but then it suddenly jumps to 100% and fails with error code 0x800f0831 no matter how often I retry.

I've already tried stopping and restarting all the update services, renaming SoftwareDistribution and catroot2, Dism and scannow as advised in the forums but it keeps failing. I also downloaded the update from the Microsoft Update Catalog and tried installing it with the msu installer but this also keeps failing. At first it's fine but when the progress bar reached approximately 20% it also jumps to 100% and fails - just like Windows Update.

I don't have any idea why this happens but I may have an idea. Yesterday, when Windows automatically tried to install the update and it failed for the first time the controlled folder access of the Windows Defender ransomware protection blocked a "VSSVC.exe" and "svchost.exe", two Microsoft services that were probably needed for the installation. Why the built-in AV would block a Microsoft service is beyond me, so I scanned my PC with Defender, Hitman Pro and Malwarebytes and nothing was found. I'm really careful as far as browsing, downloads etc. are concerned so I doubt there's anything malicious on my system, especially after scanning with three AVs (of course they're not always installed, only for 2nd opinion scans after the blocks).

Nevertheless, I thought controlled folder access may have caused the problem, so I turned it off right after the first fail but it keeps failing. Any ideas? I really hope I can install the update soon because it's apparently a quite important security fix.


I made an inplace upgrade which recommended by this post from poster karelVos

I found in another website the following instructions:

If any of our aforementioned solutions did not work for you, you should try performing a clean install. If there are corrupted, missing, or damaged system files, the only foolproof manner of dealing with them would be to reinstall your system. Once you’ve done that, you can perform the updates and get rid of the error 0x8007042B. Here is the process:

  1. Go to Microsoft’s website and download the Media Creation Tool.
  2. Save it to a USB flash drive, then install it to your computer.
  3. Choose Upgrade this PC now, then click Next.
  4. The tool will now start preparing the necessary files.
  5. Select the ‘Download and install updates (recommended)’ option, then click Next.
  6. Wait while setup is downloading the necessary files.
  7. Follow the on-screen instructions until you reach the ‘Ready to install’ screen.
  8. Select the ‘Change what to keep’ option.
  9. Don’t forget to select the ‘Keep personal files and apps’ option, then click Next.
  10. Follow the on-screen instructions to complete the setup.

Problem solved by my PC with all my apps en other data kept.


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Question Info

Last updated July 14, 2020 Views 7,047 Applies to: