The internet can be a dangerous place. Keep your home or small-business PC better protected with Microsoft Security Essentials. Help guard against viruses, spyware, and malicious software of all kinds.
You can't put a price on protection—so we didn't. Designed to be easy to use, Microsoft Security Essentials is a free* program that runs in the background, so you don’t have to be bothered by updates or interruptions.
Get Microsoft Security Essentials
Get product info
Get help with Microsoft Security Essentials
Install the latest service pack to keep your PC up to date. A service pack is a free* update to Windows that helps make Windows more reliable and secure, with security and performance improvements and support for new types of hardware.
Get service packs
This is the place to find useful extras, utilities, and add-ons to get the most out of your PC.
Get them now
* Internet access fees may apply while downloading. Your PC must run
to install Microsoft Security Essentials.
Get the latest version of Internet Explorer for your operating system.
Free downloads to view Windows in your preferred language.
Get the most out of Windows XP with these free downloads.
Learn more about drivers for your devices and hardware.