Not to be confused with Compal Electronics. Compaq (a portmanteau of Compatibility And Quality; occasionally referred to as CQ prior to its final logo) was a company founded in 1982 that developed, sold, and supported computers and related products and services.
Windows Defender is a freeware program designed to protect against spyware and other unwanted software. Windows XP and Windows Server 2003 users who have genuine copies of Microsoft Windows can freely download the program from Microsoft's web site, and Windows Defender ships as part of Windows Vista and 7.
The Bottom Line. Windows Defender is a free security solution that protects your Windows computer from adware, spyware, and viruses. The program works with all currently supported versions of Windows. A similar free program is available as a download for Windows 7 called Microsoft Security Essentials.