{"id":12661,"date":"2024-12-14T22:29:28","date_gmt":"2024-12-15T06:29:28","guid":{"rendered":"https:\/\/www.coretechnologies.com\/blog\/?p=12661"},"modified":"2026-01-01T14:58:58","modified_gmt":"2026-01-01T22:58:58","slug":"windefend","status":"publish","type":"post","link":"https:\/\/www.coretechnologies.com\/blog\/windows-services\/windefend\/","title":{"rendered":"Essential Windows Services: Microsoft Defender Antivirus Service \/ WinDefend"},"content":{"rendered":"<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"no-lazy-load\" src=\"\/blog\/images\/microsoft-defender-340x122.webp\" title=\"Microsoft Defender Antivirus Service\" alt=\"Microsoft Defender Antivirus Service\" border=\"0\" width=\"340\" height=\"122\" \/><\/div>\n<div id=\"blog-toc-container\" style=\"margin-top:20px;\">\n<p id=\"blog-toc-title\">In this article&#8230;<\/p>\n<ul>\n<li><a href=\"#what-is-windefend-service\">What is the  Microsoft Defender Antivirus (WinDefend) Windows Service?<\/a><\/li>\n<li><a href=\"#stop-windefend\">What happens if I stop WinDefend?<\/a><\/li>\n<li><a href=\"#ok-to-disable-windefend\">Is it OK to disable the Defender service?<\/a><\/li>\n<li><a href=\"#windefend-questions\">Questions? Problems?<\/a><\/li>\n<\/ul>\n<\/div>\n<p><a name=\"what-is-windefend-service\"><\/a><\/p>\n<hr class=\"blog-section\">\n<div style=\"width:100%;margin-bottom:30px;\">\n<div style=\"margin:0px;float:right;\"><a href=\"#top\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cdn.coretechnologies.com\/images\/top.jpg\" border=\"0\" width=\"50\" height=\"18\" title=\"Go to the top\" alt=\"\" \/><\/a><\/div>\n<\/div>\n<h2 class=\"blog-caption\">What is the  Microsoft Defender Antivirus (WinDefend) Windows Service?<\/h2>\n<p>The WinDefend service is part of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Microsoft_Defender_Antivirus\" target=\"_blank\" rel=\"noopener\">Microsoft Defender Antivirus<\/a> &mdash; a real-time, anti-malware solution distributed with the Windows operating system.<\/p>\n<p>On computers where Microsoft Defender is the primary antivirus deployed, the WinDefend service is set to start automatically at boot. Furthermore, Windows sets permissions to make it nearly impossible for anyone to stop the service:<\/p>\n<div align=\"center\"><a href=\"\/blog\/images\/windefend-windows-service-automatic.png\" class=\"zoomPopup\" title=\"WinDefend starts automatically at boot\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"image-padding\" src=\"\/blog\/images\/windefend-windows-service-automatic.png\" title=\"WinDefend starts automatically at boot (click to enlarge)\" alt=\"WinDefend starts automatically at boot\" border=\"0\" \/><\/a><\/div>\n<p>However, on systems where another antivirus package is in charge, the Microsoft Defender Antivirus service takes a back seat. Instead of starting automatically, the service will start manually &mdash; only on demand:<\/p>\n<div align=\"center\"><a href=\"\/blog\/images\/windefend-windows-service-manual.png\" class=\"zoomPopup\" title=\"WinDefend will start on demand\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"image-padding\" src=\"\/blog\/images\/windefend-windows-service-manual.png\" title=\"WinDefend will start on demand (click to enlarge)\" alt=\"WinDefend will start on demand\" border=\"0\" \/><\/a><\/div>\n<p>And as you can see in the screenshot above, the service isn&#8217;t &#8220;locked down&#8221; either. An administrator can easily start, stop or restart it.<\/p>\n<p><a name=\"stop-windefend\"><\/a><\/p>\n<hr class=\"blog-section\">\n<div style=\"width:100%;margin-bottom:30px;\">\n<div style=\"margin:0px;float:right;\"><a href=\"#top\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cdn.coretechnologies.com\/images\/top.jpg\" border=\"0\" width=\"50\" height=\"18\" title=\"Go to the top\" alt=\"\" \/><\/a><\/div>\n<\/div>\n<h2 class=\"blog-caption\">What happens if I stop WinDefend?<\/h2>\n<p>It depends on how your system&#8217;s configured.<\/p>\n<h3 class=\"blog-caption\">If you have another antivirus package installed&#8230;<\/h3>\n<p>First, if you&#8217;ve installed another antivirus package, stopping the WinDefend service won&#8217;t cause any problems. In fact, it&#8217;s probably better not to run the service, to avoid conflict with your main virus protection software.<\/p>\n<p>For example, we rely on <a href=\"https:\/\/www.avira.com\/\" target=\"_blank\" rel=\"noopener\">Avira Security<\/a> to protect our PC. And things work beautifully when the Defender Antivirus Windows Service is stopped:<\/p>\n<div align=\"center\"><a href=\"\/blog\/images\/windefend-service-stopped-with-avira-security.png\" class=\"zoomPopup\" title=\"The WinDefend service is stopped when Avira Security is installed\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"image-padding\" src=\"\/blog\/images\/windefend-service-stopped-with-avira-security.png\" title=\"The WinDefend service is stopped when Avira Security is installed (click to enlarge)\" alt=\"The WinDefend service is stopped when Avira Security is installed\" border=\"0\" width=\"520\" \/><\/a><\/div>\n<h3 class=\"blog-caption\">If Defender is the primary\/only antivirus package installed&#8230;<\/h3>\n<p>On the other hand, if Microsoft Defender is the primary antivirus package protecting your computer, it will be difficult to stop the WinDefend service. That&#8217;s by design; Microsoft wants to ensure that your computer is always protected from attack. As such, you&#8217;ll notice that the service is &#8220;unstoppable&#8221; from the Services application:<\/p>\n<div align=\"center\"><a href=\"\/blog\/images\/windefend-service-unstoppable.png\" class=\"zoomPopup\" title=\"The Microsoft Defender Antivirus service is unstoppable\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"image-padding\" src=\"\/blog\/images\/windefend-service-unstoppable.png\" title=\"The Microsoft Defender Antivirus service is unstoppable (click to enlarge)\" alt=\"The Microsoft Defender Antivirus service is unstoppable\" border=\"0\" width=\"520\" \/><\/a><\/div>\n<p>And any attempts to stop WinDefend with the NET or SC commands will fail with &#8220;access is denied&#8221; errors:<\/p>\n<div align=\"center\"><a href=\"\/blog\/images\/access-denied-stopping-windefend.png\" class=\"zoomPopup\" title=\"Access denied when stopping WinDefend\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"image-padding\" src=\"\/blog\/images\/access-denied-stopping-windefend.png\" title=\"Access denied when stopping WinDefend (click to enlarge)\" alt=\"Access denied when stopping WinDefend\" border=\"0\" \/><\/a><\/div>\n<p>But if you&#8217;re the persistent type and you do manage to stop the WinDefend service &mdash; perhaps by following <a href=\"https:\/\/www.youtube.com\/watch?v=31TDHRegTLM\" target=\"_blank\" rel=\"noopener\">this helpful video<\/a> &mdash; the effect will be straightforward. <b>Your computer won&#8217;t be protected from malicious actors.<\/b> Please be careful, especially if you&#8217;re connected to the Internet!<\/p>\n<p><a name=\"ok-to-disable-windefend\"><\/a><\/p>\n<hr class=\"blog-section\">\n<div style=\"width:100%;margin-bottom:30px;\">\n<div style=\"margin:0px;float:right;\"><a href=\"#top\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cdn.coretechnologies.com\/images\/top.jpg\" border=\"0\" width=\"50\" height=\"18\" title=\"Go to the top\" alt=\"\" \/><\/a><\/div>\n<\/div>\n<h2 class=\"blog-caption\">Is it OK to disable the Defender service?<\/h2>\n<p>Again, it depends on your situation and what you&#8217;re willing to accept.<\/p>\n<p>You can easily disable the Defender service if you have a third-party antivirus package installed. That&#8217;s completely fine.<\/p>\n<p>But if Defender is your only line of defense, disabling WinDefend will leave your computer vulnerable to attack. Is that acceptable in your situation? Only you can say.<\/p>\n<p><a name=\"windefend-questions\"><\/a><\/p>\n<hr class=\"blog-section\">\n<div style=\"width:100%;margin-bottom:30px;\">\n<div style=\"margin:0px;float:right;\"><a href=\"#top\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cdn.coretechnologies.com\/images\/top.jpg\" border=\"0\" width=\"50\" height=\"18\" title=\"Go to the top\" alt=\"\" \/><\/a><\/div>\n<\/div>\n<h2 class=\"blog-caption\">Questions? Problems?<\/h2>\n<p>If you&#8217;d like to know more about the Microsoft Defender Antivirus service, or you have a specific problem, please feel free to <a href=\"\/support\/\">get in touch<\/a>. We&#8217;ll do our best to help you!<\/p>\n<div style=\"margin-top:30px\" align=\"center\">\n<div class=\"cta-button-1\">\n<table role=\"presentation\" cellspacing=\"0\" cellpadding=\"0\" border=\"0\" align=\"left\">\n<tbody>\n<tr>\n<td align=\"center\"><a href=\"\/blog\/tag\/essential-windows-services\/\" title=\"Find more important Windows Services\"><span><nobr>More Essential Windows Services&#8230;<\/nobr><\/span><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<!-- relpost-thumb-wrapper --><div class=\"relpost-thumb-wrapper\"><!-- filter-class --><div class=\"relpost-thumb-container\"><style>.relpost-block-single-image, .relpost-post-image { margin-bottom: 10px; }<\/style><h3>You may also like...<\/h3><div style=\"clear: both\"><\/div><div style=\"clear: both\"><\/div><!-- relpost-block-container --><div class=\"relpost-block-container relpost-block-column-layout\" style=\"--relposth-columns: 3;--relposth-columns_t: 2; --relposth-columns_m: 2\"><a href=\"https:\/\/www.coretechnologies.com\/blog\/windows-services\/restart-service-when-event-reported\/\"class=\"relpost-block-single\" ><div class=\"relpost-custom-block-single\"><img decoding=\"async\" loading=\"lazy\" class=\"relpost-block-single-image\" alt=\"Q&amp;A: How do I Restart a Windows Service when an Event is Reported?\"  src=\"https:\/\/www.coretechnologies.com\/blog\/wp-content\/uploads\/restart-service-event-trigger-150x150-1.png\" style=\"aspect-ratio:1\/1\" style=\"aspect-ratio:1\/1\"><\/img><div class=\"relpost-block-single-text\"  style=\"height: 75px;font-family: Arial;  font-size: 12px;  color: #333333;\"><h2 class=\"relpost_card_title\">Q&amp;A: How do I Restart a Windows Service when an Event is Reported?<\/h2><\/div><\/div><\/a><a href=\"https:\/\/www.coretechnologies.com\/blog\/alwaysup\/is-alwaysup-safe\/\"class=\"relpost-block-single\" ><div class=\"relpost-custom-block-single\"><img decoding=\"async\" loading=\"lazy\" class=\"relpost-block-single-image\" alt=\"Is AlwaysUp safe?\"  src=\"https:\/\/www.coretechnologies.com\/blog\/wp-content\/uploads\/alwaysup-boxshot-150x150.png\" style=\"aspect-ratio:1\/1\" style=\"aspect-ratio:1\/1\"><\/img><div class=\"relpost-block-single-text\"  style=\"height: 75px;font-family: Arial;  font-size: 12px;  color: #333333;\"><h2 class=\"relpost_card_title\">Is AlwaysUp safe?<\/h2><\/div><\/div><\/a><a href=\"https:\/\/www.coretechnologies.com\/blog\/windows-services\/chatgpt\/\"class=\"relpost-block-single\" ><div class=\"relpost-custom-block-single\"><img decoding=\"async\" loading=\"lazy\" class=\"relpost-block-single-image\" alt=\"ChatGPT Knows Windows Services\"  src=\"https:\/\/www.coretechnologies.com\/blog\/wp-content\/uploads\/chatgpt-ai-windows-services-150x150-1.webp\" style=\"aspect-ratio:1\/1\" style=\"aspect-ratio:1\/1\"><\/img><div class=\"relpost-block-single-text\"  style=\"height: 75px;font-family: Arial;  font-size: 12px;  color: #333333;\"><h2 class=\"relpost_card_title\">ChatGPT Knows Windows Services<\/h2><\/div><\/div><\/a><\/div><!-- close relpost-block-container --><div style=\"clear: both\"><\/div><\/div><!-- close filter class --><\/div><!-- close relpost-thumb-wrapper -->","protected":false},"excerpt":{"rendered":"<p>In this article&#8230; What is the Microsoft Defender Antivirus (WinDefend) Windows Service? What happens if I stop WinDefend? Is it OK to disable the Defender service? Questions? Problems? What is the Microsoft Defender Antivirus (WinDefend) Windows Service? The WinDefend service &hellip; <a href=\"https:\/\/www.coretechnologies.com\/blog\/windows-services\/windefend\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":12697,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[31,78,362,361,196],"class_list":["post-12661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-windows-services","tag-antivirus","tag-essential-windows-services","tag-microsoft-defender","tag-windefend","tag-windows-services-2"],"_links":{"self":[{"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/12661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/comments?post=12661"}],"version-history":[{"count":17,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/12661\/revisions"}],"predecessor-version":[{"id":13305,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/12661\/revisions\/13305"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/media\/12697"}],"wp:attachment":[{"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/media?parent=12661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/categories?post=12661"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.coretechnologies.com\/blog\/wp-json\/wp\/v2\/tags?post=12661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}