If issue persists, check for updates and install any updates available. -Press Windows key + X -Go to Settings -Click Update and Security -Check for Updates and install all updates available. Restart once done and check the Windows Security. I hope the information above helps. Please let me know how it goes. Have a wonderful day ahead and stay
Since the issue has not been resolved, please provide us your log files for Windows Essentials for us to further investigate the issue. I have provided you a private message where you can find the instructions on how to gather the logs and where you can upload the files for security purposes.

Based on the issue description I can understand that you are not able to update Microsoft security essential. Not to worry we will guide you to get the issue resolved. Most of the time if the update is not getting installed then there is an issue with the actual applications or windows update component might be corrupted not letting the windows

Note: The antivirus providers listed on this page might be unavailable for your version of Windows or in your country or region. CyRadar. McAfee. Avast Free Antivirus. G DATA. Trend Micro. Kaspersky Lab AO. Arcabit. NortonLifeLock.
1. Install the latest updates from Microsoft Update. Note A computer virus may prevent you from accessing the Microsoft Update website to install the latest updates. We recommend that you set the Automatic Updates service to run automatically so that a computer is not missing any important updates. For more information, see Windows Update: FAQ
Innovative identity protection. Windows 11 PCs protect your identity by using advanced security methods for logging into your device. There are over 920 password attacks every second. That’s why we’ve innovated solutions that redefine log-in credentials. Windows 11 validates your credentials using either a device-specific PIN code
I would like to find out how to stop Windows Update from showing Microsoft Security Essentials. KB2902907. KB3140479. Everytime I check for updates. fERNYw.
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    • microsoft security essentials not updating