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.
Windows Defender is a free program that Microsoft includes with Windows 10. It protects your computer from spyware, viruses and other malware (i.e., malicious software that harms your device). It used to be called Microsoft Security Essentials.. It's turned on by default when you first start up Windows 10 but can be turned off.