Microsoft Windows Defender (formally known as Windows
AntiSpyware) is a security technology that helps protect Windows
users from spyware and other potentially unwanted software. Known
spyware on your PC can be detected and removed. This helps reduce
negative effects caused by spyware, including slow PC performance,
annoying pop-up ads, unwanted changes to Internet settings, and
unauthorized use of your private information. Continuous protection
improves Internet browsing safety by guarding more than 50 ways
spyware can enter your PC.
Get the latest version from here