Windows Defender is a software product from Microsoft to prevent, remove and quarantine spyware in Microsoft Windows. It was formerly known as Microsoft AntiSpyware. It is included and enabled by default in Windows Vista and Windows 7, and is available as a free download for Windows XP and Windows Server 2003.
Windows Defender features system scan capabilities similar to other free products on the market, and includes a number of real-time security agents that monitor several common areas of Windows for changes which may be caused by spyware. It also includes the ability to easily remove ActiveX applications that are installed. If it detects anything suspicious, an alert will appear on the screen.
