KB5034121 Fails to Install/Stuck on Loading on Windows 11 21H2

Solve the problem of Windows 11 KB5034121 update installation failure or stuck

KB5034121 is a cumulative update for Windows 11 21H2 in January 2024, but some users reported that KB5034121 cannot be installed or stuck in the loading interface. This article provides several solutions.

Although Microsoft has stopped supporting Windows 11 21H2, installing KB5034121 can still improve system security and avoid malware attacks. If your Windows Update fails to download or install KB5034121, try the following:

Manually install KB5034121

You can download the update package from Microsoft Update Catalog and install it manually:

1. Use a browser to access the Microsoft Update Catalog website: https://www.php.cn/link/9f79d3e1e0806ef608303015cb30403b
2. Search for KB5034121, find the corresponding cumulative update, and select the appropriate version to download.

3. Click the download link to get the .msu file.
4. Double-click the downloaded file to install the update.

If the manual installation still fails, try the following fix:

Method 1: Troubleshooting for running Windows Update

Windows Update troubleshooting can detect and fix issues that prevent Windows Update from downloading and installing.

1. Use the shortcut key Win I to open Windows settings.
2. Go to System > Troubleshooting > Other Troubleshooting .
3. Click the Run button next to Windows Update to diagnose and fix update issues.

Method 2: Clear Windows Update file

Clearing Windows Update cache files can sometimes resolve installation issues.

1. Search for "Services" in the search bar to open the service application.
2. Find Windows Update and Background Intelligent Transfer Service , right-click and select Stop .
3. In File Explorer, go to the C:\Windows\SoftwareDistribution\Download folder and delete all files in it.
4. Restart the service that was stopped before.

Method 3: Disable security software

Antivirus software can sometimes interfere with Windows updates. Temporarily disable Windows Security Center or third-party antivirus software and try to install the update again.

Method 4: Try to start cleanly

Third-party software conflicts may also lead to update failures. A clean boot can help eliminate software conflicts.

1. Press Win R , enter msconfig , and click OK .
2. In the Services tab, select Hide all Microsoft services and click Disable All .
3. Click Apply > OK to save changes.

Method 5: Run the System File Checker (SFC)

Corrupted system files may also cause update failures.

1. Run command prompt as administrator.
2. Enter sfc /scannow and press Enter .

Summarize

After trying the above method, you should be able to successfully install the KB5034121 update. Since Windows 11 21H2 has been discontinued, it is recommended to upgrade to the 22H2 or 23H2 version for better security and functional support. Be sure to back up your files before updating to prevent data loss.

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