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Defender that comes with windows 8 is a state of the art anti virus and ani spyware program that neatly integrates with all your browsers, checks in coming files, runa quietly in the background. Windows defense, formally named windows defense antivirus in windows 10 creators update, is an anti-malware element of microsoft windows. it was first released as a free antispyware program download for windows xp, shipped with windows vista and windows 7 and converted to the full antivirus program changing microsoft protection essentials as part of windows 8 and later versions.. Windows defender antivirus is a built-in antimalware solution that provides next generation protection for desktops, portable computers, and servers. windows defender antivirus includes: cloud-delivered protection for near-instant detection and blocking of new and emerging threats..