When upgrading your Microsoft Security Essentials program to the latest version or updating it with virus, malware definitions and patches etc., you may encounter miscellaneous errors. These errors result in product upgrade or update failure. Such errors are commonly caused by disabled Microsoft Update service or outdated Microsoft updates that update Microsoft Security Essentials. Check the steps given below and fix Microsoft Security Essentials errors:
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1. Restart the Microsoft Update service. Click the Start button> type ‘services.msc’ in the Start Search bar. Hit the Enter key. If prompted, enter your admin password and proceed. Look for Windows Update> right-click it and click Start. If you don’t see Start, you may see Restart, click it. When done, exit the Services window.
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2. Exit all other windows also. Launch Microsoft Security Essentials from the system tray or the desktop shortcut. Click the Update tab> click the Update button to start updating the program with the latest virus and malware definitions. If you are upgrading the program, click the Help tab> select Upgrade Microsoft Security Essentials. Follow the on-screen prompts and complete the procedure.
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3. If you continue to face errors while updating or upgrading Microsoft Security Essentials, download the Microsoft Windows Update Troubleshooter. Check this link for download: http://windows.microsoft.com/en-US/windows7/Troubleshoot-problems-with-installing-updates. Click Run and then Run again to run the troubleshooter.
4. Wait while the troubleshooter prepares itself. When prompted, check the I Agree box to accept the license use terms & conditions. Click Next. Make sure that you are logged in with admin rights to your PC. Otherwise, you will see an error message. If you are not logged in as an admin, log off and then log back in with admin rights. You can now run the tool.5. The troubleshooter will diagnose and automatically fix any Windows Update problems. When done, close all the windows and restart your PC (if required and prompted). Afterwards, launch Microsoft Security Essentials and try to update or upgrade it. You should not face any problems while doing so.
***You can also find here Virus Removal Support, Trojan Removal Support, Windows Repair support.