Solved Windows 11 update KB5033375 keeps failing to install

Windows 11 update KB5033375 keeps failing to install. The option to have the updates installed early is off, so I suppose this update is not an early released patch? Nevertheless, it has failed to install many times - it actually fails while it is downloading.

What makes no sense whatsoever is the code that is issued with the failure: 0xc1900401. According to the solution(s) offered (by Microsoft - Redirecting) as a fix for this issue, is to check OS build and fix it with SFC /Scannow if it is corrupted.

Yesterday, I uninstalled the AV app, ran DISM and SFC /Scannow, rebooted, rechecked the OS build (DISM and SFC /Scannow), and allowed the patch to be downloaded and installed - the process failed with the same reason - while being downloaded, so, I went to the Microsoft website and downloaded the MSU file so I could run it from the pc. Before trying to execute the MSU, I rechecked the OS build (and took some snapshots/screenshots so I can post them here if needed). The execution of the MSU file failed as well. Same reason --> 0xc1900401.

Someone mentioned to me that Windows 11 update KB5033375 is failing to install because it is superseded, by another update. Is that the case?

Welcome to the forum.
1. run troubleshooter-settings-system-troubleshoot-other troubleshooters-windows update-RUN.

2. Reset Windows update using Brink's tutorial Reset Windows Update in Windows 11 Tutorial

3. Run sfc (which you've already done) but do it again after resetting update components

4. CLEAN UP COMPONENT STORE - dism /online /cleanup-image /startcomponentcleanup
Analyze and Clean Up Component Store (WinSxS folder) in Windows 11 Tutorial
Check for updates again.
If they still fail Do a repair install. Repair Install Windows 11 with an In-place Upgrade Tutorial

I ran the Windows Update troubleshooter and it indicated it had found something that had to be fixed - I could not verify though that it fixed it.
BTW, I had executed steps 2,3, and 4 yesterday, and I was going to re-do the process, but I tried to create a restore point first. When I went to the Windows Settings>System window and clicked on System protection, I got a pop-up message and a code indicating the function was broken/not-functional - in addition there was nothing listed under Available Drives. I checked the web for solution(s) but none worked, so I decided to restore my system from one of the weekly backups (full image of the boot disk).
I went to a backup that was taken before the issues started with the installation of KB5033375 and used it to restore my system.
After I rebooted, I checked the restore point creation function and it was functional. In addition, I noticed that Windows Update had already downloaded KB5033375 (this was failing before), and it was ready to install the patch.
I made another full image of the boot disk with the back app, and then had the patch installed. This time it was successful.
The installation of this patch does not have any issues with AV apps like Malwarebytes, as I did not have to de-activate the app.

I suppose we can close this thread.

Glad you got it sorted for whatever the cause of it. Sometimes there's no rhyme or reason to some of this stuff. I'm positive gremlins get into these machines sometimes.

I just tried this now - I cancelled the troubleshoot after a while, and the first run of reset (bat) failed to stop WU as in use, then on restart windows reported it was updating. After restart I reran the reset bat, restarted, then ran sfc /scannow then dism , as advised, but no change in WU.

Pretty sure both these are already installed (conexant is working).



Update History shows a few different error codes


Is there anything else I can try? CBS log available if that helps?

@jonny Disable all third party AV (not Defender). This includes MWB if you have it. Check task manager to verify that no AV processes are running.
Go through the steps in post #2 again. Run the bat file as administrator.

Thanks. It's a new build no other av. Been trying to disable defender as it keeps quarantining stuff. Had to look up malwarebytes. Blast from the past!

Am running in administrator session

I can get a list of running services if that helps?
I may have disabled or made manual some auto services... stabbing with clutched straws in the dark

jonny said:

may have disabled or made manual some auto services..

Click to expand...

If that doesn't work, all I can suggest for you is to do a repair install. If you still have issues, open a new thread of your own stating the problem and everything you've done to try to fix it.

Looks like ill hardware, possibly! The most suspect, usually is a faulty SSD, as they can fail with a sudden error message from Windows about a file being corrupted. Another symptom of a bad SSD, is Windows becomes extremely slow!

The most suspect other than that, is malware!

IMHO, I recommend that you wipe the SSD and try a clean install.

There is an issue with an ssd (another issue for another time), but disk scans report okay.
It's more likely to be my system config!

Happy to report eventually resolved (made the hide updates work), even if not sure which exact steps sorted. used the shutup tool, so likely many new error events will be thrown by changes made by that!