Windows Update Keeps Failing? How to Fix It

A Windows update that repeatedly fails is usually blocked by low disk space, a damaged update download, a stuck service, system-file corruption, network trouble, or third-party security software.

This guide applies to Windows 10 and Windows 11 when the same update fails again and again, with or without an error code.

Does This Affect You?

Use these steps if Windows downloads an update, starts installing, then fails and retries with the same result. Work in order: space, troubleshooter, update cache, then system-file repair.

Free Space and Run the Troubleshooter

1. Open File Explorer and check free space on the main drive, usually C:. Large updates may need many gigabytes free.
2. Open Settings > System > Storage > Temporary files and remove safe cleanup items if space is low.
3. Open Settings > System > Troubleshoot > Other troubleshooters. On Windows 10, use Update & Security troubleshooters.
4. Run the Windows Update troubleshooter.
5. Restart and try Windows Update again.

Reset Windows Update Components

1. Open Command Prompt as administrator.
2. Stop update services with net stop wuauserv, net stop cryptSvc, net stop bits, and net stop msiserver.
3. Rename the caches with ren C:WindowsSoftwareDistribution SoftwareDistribution.old and ren C:WindowsSystem32catroot2 catroot2.old.
4. Restart services with net start wuauserv, net start cryptSvc, net start bits, and net start msiserver.
5. Restart the PC and check for updates.

Repair System Files

1. Open Command Prompt as administrator.
2. Run sfc /scannow.
3. Run DISM /Online /Cleanup-Image /RestoreHealth. Keep the PC online.
4. Restart, then try the update again.

More Update Failure Options

Search the Error Code

Codes such as 0x80070070 or 0x8024402F often point to a narrower issue such as disk space or network trouble. Search Microsoft support for the exact code.

Install the KB Manually

Find the update KB number in Update history and search it in the Microsoft Update Catalog. Manual installation can succeed when the normal update path fails.

Use Update Assistant for Feature Updates

For a major Windows version upgrade, Microsoft’s Windows Update Assistant or Installation Assistant may install through a different path that avoids the stuck built-in updater.

Temporarily Disable Third-Party Antivirus

Some antivirus suites interfere with update installation. Disable real-time protection only long enough to install, then turn it back on.

Sources

• Microsoft Support: Fix Windows Update errors
• Microsoft Support: Windows Update FAQ
• Microsoft Learn: Reset Windows Update components

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