Microsoft Security Essentials reached end of service on Januand is no longer available as a download. What happened to Microsoft Security Essentials? After you uninstall other security programs, restart your computer and ensure that the Windows firewall is on. The solution to this problem is to uninstall other security programs that may be running. Why is Microsoft Security Essentials not working?Įven though Microsoft Security Essentials opens, you may not be able to turn its real-time protection on. How do I fix virus and spyware couldn't be updated?.How do I update my spyware on Windows 10?.What is the latest version of Microsoft Security Essentials?.