Help keep your PC safe

Applies to: Windows 10Windows 7Windows 8.1

Windows security

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

Stay Up To Date

Install the latest service packs or other free** updates to help make Windows more reliable and secure.

Learn more

Choose how updates are installed

Get help with Windows Update

Get More Tools

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. 
**Internet access fees may apply while downloading.