Windows Defender is a free Microsoft program to protect against spyware but also with other undesirable components (rootkits, keyloggers, etc.). In addition to on-demand scanning, the program offers protection against unwanted changes in real time. The dedicated and operating agent in the background contains, among others, a module monitoring changes in the range of programs launched automatically at the start of the system, system settings, services and drivers, Internet Explorer browser, etc.

Hazardous components are detected on the basis of automatically downloaded signatures. Thanks to the Software Explorer function we can check and possibly block selected programs (processes) are started at the start of the system, started at a given moment, or using an Internet connection. Windows Defender allows you to optionally participate in SpyNet, which allows you to automatically exchange information about Internet threats between users of the program.

Most functions are supported by wizards, so both advanced users and beginners should have no difficulty in effectively configuring all elements of the tracking software search engine.