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
If you’re looking to protect a PC with an older version of Windows*, Microsoft Security Essentials helps 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
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
* Windows Defender is included in Windows 8, Windows RT, Windows 8.1, Windows RT 8.1, and Windows 10. Microsoft Security Essentials supports Windows 7 and Windows Vista. 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.
Find info about virus removal, security settings, firewalls, and other ways to protect your PC.
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.