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
The latest versions of Windows** come with Windows Defender to help protect your PC from viruses and other kinds of malware.
Learn more about Windows Defender
Install the latest service packs or other free** updates to help make Windows more reliable and secure.
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.
** Windows Defender is included in Windows 8, Windows RT, Windows 8.1, Windows RT 8.1, and Windows 10.
Learn more about drivers for your devices and hardware.
Get to know the latest features in Windows 10.
Explore an exciting new generation of PCs designed for Windows.