Support ended for Windows XP on April 8, 2014. Microsoft will no longer provide security updates for Windows XP to help protect your PC against malware. Microsoft has also stopped providing Microsoft Security Essentials for download on Windows XP. If you already have Microsoft Security Essentials installed, you will continue to receive Microsoft Security Essentials updates for a limited time * to help identify malware on your PC while you complete your transition to a fully supported operating system. The Malicious Software Removal Tool will continue to be provided for Windows XP for a limited time * through Windows Update and the Download Center.
We strongly recommend that you complete your migration to a supported operating system as soon as possible so that you can receive regular security updates to help protect your computer from malicious attacks.
* The Malicious Software Removal Tool and updates to Microsoft Security Essentials will continue to be provided for Windows XP through July 14, 2015.
Windows 8 and Windows RT include Windows Defender to help keep your PC safer.
Get help with Microsoft Security Essentials.
Get more information on Microsoft Security Essentials.