Microsoft Security Essentials supports Windows 7 and Windows Vista, and is available in many locales and languages. If it is not available in your preferred language, you can install it in any of the other languages listed here, and it will still work to help protect your PC.
Choose your preferred locale or language from the list that follows.
Choose your operating system to begin the download process.
If you need help finding which version of Windows you're running, see
Is my PC running the 32-bit or 64-bit version of Windows?
As of April 8, 2014, technical support for Windows XP and Windows XP Mode are no longer available, including updates that help protect your PC.
Learn more about Windows XP end of support
* Internet access fees may apply while downloading.