If you use OneCare, you do not need to download Windows Defender.
Windows Defender helps protect your computer against spyware and other unwanted software. It's free to download for Windows XP SP2 users and is built into Windows Vista.
Learn the basics about what spyware is, how it gets inside your computer, and what it might be doing there.
Check this list of spyware symptoms to help ensure your computer is free of spyware.
Help protect your computer against spyware and other unwanted software.
Find the resources you can use to help remove spyware from your computer.
Find information specific to the version of Windows on your computer.
