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Windows Defender is a free and useful utility provided by Microsoft for all operating systems (XP, Vista, Windows 7). Windows Defender is designed to protect your operating system from any potentially dangerous software, spyware and other unwanted or malicious programs. The program runs in the background, thus producing a discreet and continuous protection. It also keeps track of all the changes in the operating system, noting all suspicious objects, which are then quarantined or removed.