Windows XP operating system, installed with Microsoft Security Essentials antivirus software. If you are prompted to install the patch Update for Microsoft Security Essentials-4.5.216.0 (kb2949787), do not Update it. If the patch MSE is installed, a window is displayed, prompting you to stop the service when XP is about to expire. If this patch has been installed, you must uninstall MSE and find the MSE installation program on the Internet and reinstall it.
Update for Microsoft Security Essentials-4.4.304.0 (kb2902885.
During this extraordinary period, we recommend that you reduce "automatic update" to "notify me when available download is available, but do not automatically download or install updates. Prepare domestic anti-virus software and Internet Security Manager software to prevent impact.
References:
KB2949787? How can I uninstall this latest update?