Windows Defender helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software. Windows Defender features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected, minimizes interruptions, and helps you stay productive.
What's new in version 1.1.1593
ReleaseJuly 15, 2009
Date AddedJuly 21, 2009
Operating SystemsWindows, Windows XP, Windows 2003, Windows Vista