Security Services and Products from Microsoft

Protect yourself from spyware, viruses, identity theft, and spam

Download Windows Live OneCare
Try a free 90-day trial version of the comprehensive security service that helps protect you from viruses, spyware, and other unwanted software.

Download Windows Defender
Free antispyware software for Windows XP SP2. (Windows Defender comes with Windows Vista.)

Download Malicious Software Removal Tool
This tool checks computers running Windows Vista, Windows XP, Windows 2000, and Windows Server 2003 for infections by malicious software and help remove any infection found.

Download Windows SteadyState
This tool returns your Windows settings to their original state, so you can remove any inadvertent changes.

Download Windows Live Messenger
You can use Windows Live Messenger and the Windows Live OneCare safety scanner to diagnose and fix everything from viruses to hard-disk fragmentation remotely.

Download Microsoft Phishing Filter
Whether you're shopping or surfing, don’t be a victim of identity theft: Block fraudulent Web sites.