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The error 0x80040154 when trying to download or install Windows 11 update KB5055523 typically means a specific system component or COM class is not registered or available. This is often a Windows Update system error indicating a missing, unregistered, or corrupt system file or service.

Here are the main causes of this issue and how to address them:

1. Corrupted or Unregistered Windows Update Components
This error is often triggered when key Windows Update modules or services (like WUAPI or COM components) are not properly registered.

Fix: Re-register Windows Update DLLs

Open Command Prompt (Admin) and run:

cmd
Copy
regsvr32 wuapi.dll
regsvr32 wuaueng.dll
regsvr32 wups.dll
regsvr32 wups2.dll
regsvr32 wuwebv.dll
regsvr32 wucltux.dll
Restart your PC and try the update again.

2. Corrupted System Files
If system files related to Windows Update or COM services are damaged or missing, the update won't proceed.

Fix: Use System File Checker and DISM

Open Command Prompt (Admin) and run:

sfc /scannow

Then:

DISM /Online /Cleanup-Image /RestoreHealth

These tools will scan and fix corrupted Windows system files that may be blocking KB5055523.

3. Windows Update Services Are Not Running
Essential services like Windows Update, BITS, and Cryptographic Services may be disabled or stuck.

Fix: Restart Update Services

Press Win + R, type services.msc, press Enter.

Make sure these are running and set to Automatic:

Windows Update

Background Intelligent Transfer Service (BITS)

Cryptographic Services

Windows Installer

Right-click and Start them if needed.

4. Third-Party Antivirus or Security Software Interference

CHAPTERS
00:00 Intro
00:28 Solution 1
01:35 Solution 2
03:04 Solution 3
06:41 Solution 4
08:02 Outro