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Click the Windows logo in the bottom-left corner of the screen. The Start menu will pop up. Click the gear-shaped Settings icon in the lower-left side of the Start menu. Doing so opens the Settings window. It's in the bottom row of Settings options. This tab is in the upper-left side of the window. It's the first option below the "Protection areas" heading near the top of the page. Doing so opens the Windows Defender window. You'll find this option in the middle of the page. Click the blue "On" switch {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/0a\/Windows10switchon.png","bigUrl":"\/images\/thumb\/0\/0a\/Windows10switchon.png\/57px-Windows10switchon.png","smallWidth":460,"smallHeight":218,"bigWidth":"57","bigHeight":"27","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"} below the "Real-time protection" heading, then click Yes when prompted. This will turn off the real-time scanning feature of Windows Defender.  You can also disable Windows Defender's cloud-based protection by clicking the blue "On" switch below the "Cloud-delivered protection" heading and then clicking Yes when prompted. Windows Defender will turn itself back on the next time you restart your computer.
Open Start . Open Settings . Click  Update & Security. Click Windows Security. Click Virus & threat protection. Click Virus & threat protection settings. Disable Windows Defender's real-time scanning.