Additional Microsoft Defender tools and services that provide security across various platforms and environments
That message usually means Windows still has not completed the latest security update, or something is blocking Windows Update.
Try these steps in order:
- Go to Start > Settings > Update & Security > Windows Update.
- Select Check for updates and install everything offered.
- Restart the PC, then check again.
If the message remains, common causes include:
- driver problems
- not enough free disk space
- another program blocking the update
- third-party antivirus or security software interfering
Next steps:
- Run the Windows Update troubleshooter:
- Start > Settings > Update & Security
- Troubleshoot
- Additional troubleshooters
- Windows Update > Run the troubleshooter
- If third-party antivirus is installed, temporarily uninstall it, update Windows, then reinstall it.
- Important: make sure the reinstall method and any product keys are available before uninstalling.
- Repair hard drive errors:
- Open Command Prompt as administrator.
- Run:
chkdsk /f C: - Restart when prompted.
- Reset Windows Update components.
- Warning: these are advanced command-line steps and require administrator permissions.
- Open Command Prompt as administrator and run these commands one at a time:
net stop bits net stop wuauserv ren %systemroot%\softwaredistribution softwaredistribution.bak ren %systemroot%\system32\catroot2 catroot2.bak net start bits net start wuauserv - Restart the PC after the commands finish.
If the device still cannot update after that, the supported next options are:
- reinstall Windows 10 to return the PC to a cleaner state
- take the PC to a qualified repair technician
- move to a newer Windows 11 PC if the current device cannot support newer versions
Also note: support for Windows 10 ends after October 14, 2025.