How to Fix KB5017321 or KB5017026 Update Not Installing on Windows 11

If you’re running Windows 11 and encountering issues with the latest update not installing, follow these steps to fix it:

  1. Check for Updates: Ensure that your device is up-to-date by going to the Windows Settings menu and selecting "Windows Update". If an update is available, download and install it.
  2. Disable Windows Defender Firewall Temporarily: Sometimes, Windows Defender Firewall can prevent updates from installing. Temporarily disable it by following these steps: Press Windows key + X, select "Windows Defender Firewall (Admin)", click on "Turn Windows Defender Firewall off", and restart your device.
  3. Run SFC Scan: Use the built-in System File Checker tool to fix corrupted files on your system. To run an SFC scan, open Command Prompt (Admin), type "sfc /scannow", and wait for the scan to complete before restarting your device.
  4. Perform a Disk Cleanup: Free up disk space by performing a Disk Cleanup. Open Start menu, search for "Disk Cleanup", select the drive where you want to free up space, click on "Clean up now", and wait for the cleanup process to complete before restarting your device.
    By following these steps, you should be able to fix KB5017321 or KB5017026 update not installing on Windows 11. Always check for updates and keep your device up-to-date to avoid any issues in the future.