{"id":4085,"date":"2024-03-29T16:41:35","date_gmt":"2024-03-29T16:41:35","guid":{"rendered":"https:\/\/www.auslogics.com\/en\/articles\/?p=4085"},"modified":"2025-10-07T17:53:39","modified_gmt":"2025-10-07T17:53:39","slug":"how-to-fix-windows-defender-service-wont-start-on-windows","status":"publish","type":"post","link":"https:\/\/www.auslogics.com\/en\/articles\/how-to-fix-windows-defender-service-wont-start-on-windows\/","title":{"rendered":"How to Fix Windows Defender Service That Won\u2019t Start on Windows 10?"},"content":{"rendered":"<p>However, the Windows Defender sometimes fails to start, leaving your machine defenseless. If you are here, you have probably tried restarting your computer and other tricks, but that didn\u2019t help. Well, you\u2019ve come to the right place. Today\u2019s post will explain how to solve the \u201cWindows 10 Defender won\u2019t turn on\u201d issue.<\/p>\n<h2>What Causes This Error on Windows 10 PCs?<\/h2>\n<p>Windows Defender is likely to fail on launch due to the following reasons:<\/p>\n<ul>\n<li aria-level=\"1\">Outdated operating system;<\/li>\n<li aria-level=\"1\">Wrong date and time;<\/li>\n<li aria-level=\"1\">Third-party antivirus apps;<\/li>\n<li aria-level=\"1\">Registry issues.<\/li>\n<\/ul>\n<h2>How to Solve the \u201cWindows Defender Service Won\u2019t Start\u201d Problem<\/h2>\n<p>Since varying factors trigger this error, we suggest you try different tactics until the problem disappears. Below are the techniques that proved effective on most people\u2019s devices with the same issue.<\/p>\n<h3>Method 1: Check your date and time<\/h3>\n<p>Did you know that many PC apps usually depend on the system date and time to perform some functions? Therefore, if these are incorrect, you could easily experience abnormal behaviors with some programs. Thus, ensure you check if your device reads the correct date and time. If not, correct it immediately and then check for the issue.<\/p>\n<h3>Method 2: Disable your third-party antivirus app<\/h3>\n<p>Antivirus apps usually work differently. Some can work without interfering with other programs on your computer, while others can\u2019t. If you have an invasive antivirus app, it could be the trigger. Therefore, open the app\u2019s settings and temporarily disable its protection. Then reboot your computer and check if Windows Defender will launch. If it does not, try uninstalling the third-party app to see if that helps.<\/p>\n<div class=\"notebox\">\r\n\t<div class=\"notebox__heading\">Caution<\/div>\r\n\t<div class=\"notebox__text\">Keep in mind that uninstalling security software opens your system up to malware threats . Make sure to re-enable your antivirus software as soon as possible if Windows Defender still fails to launch.\u00a0 <\/div>\r\n<\/div>\r\n\n<p>We also recommend installing a professional antivirus program that can protect your computer without interfering with other system functions. A good example of such an app is <a href=\"https:\/\/www.auslogics.com\/en\/software\/anti-malware\/\">Auslogics Anti-Malware. <\/a><\/p>\n<hr \/>\n<p><b>Also read:<\/b><a href=\"https:\/\/www.auslogics.com\/en\/articles\/windows-10-prevents-antivirus-installation\/\">Does Windows 10 Need Antivirus? <\/a><\/p>\n<hr \/>\n<h3>Method 3: Update Windows<\/h3>\n<p>Windows is an amazing operating system, but it sometimes gets buggy , triggering issues such as Windows Defender not working correctly. <a href=\"https:\/\/www.auslogics.com\/en\/articles\/do-i-need-manually-check-for-win10-updates\/\">Installing the latest updates <\/a> is the best solution. Windows can download updates in the background. However, if you have disabled updates on your computer, you might have missed some. Follow these steps to update your operating system:<\/p>\n<ol>\n<li aria-level=\"1\">Launch the Settings app by pressing Windows key + I on your keyboard.<\/li>\n<li aria-level=\"1\">Go to <em>Update &amp; security.<\/em><\/li>\n<li aria-level=\"1\">Click on the<em> \u201cCheck for updates\u201d<\/em> button.<\/li>\n<li aria-level=\"1\">Wait for the system to check for updates and download them on your machine.<\/li>\n<li aria-level=\"1\">Once done, restart your computer.<\/li>\n<li aria-level=\"1\">Now check if the problem has been fixed.<\/li>\n<\/ol>\n<p>Don\u2019t give up if you are still getting the error when trying to open Windows Defender. The following tip might help.<\/p>\n<h3>Method 4: Use the System File Checker SFC<\/h3>\n<p>File corruption is a common cause of most issues on Windows PCs. So, it could also be why you can\u2019t successfully launch Windows Defender on your machine. Luckily, the <a href=\"https:\/\/support.microsoft.com\/en-au\/topic\/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system-files-79aa86cb-ca52-166a-92a3-966e85d4094e\" target=\"_blank\" rel=\"noopener nofollow\">System File Checker <\/a> can help scan your computer for corrupted system files and immediately repair them. Here is how it works:<\/p>\n<ul>\n<li aria-level=\"1\">Press the <code>Windows logo key + S<\/code> combination to bring up the search bar.<\/li>\n<li aria-level=\"1\">Type in \u201ccommand\u201d (without quotes) and then right-click on Command Prompt.<\/li>\n<li aria-level=\"1\">Select Yes if the User Account Control (UAC) prompt appears.<\/li>\n<li aria-level=\"1\">When the Command Prompt window opens, type in <code>sfc\/scannow<\/code>, then hit Enter<\/li>\n<li aria-level=\"1\">The SFC tool will automatically scan for corrupted and damaged files and repair them.<\/li>\n<li aria-level=\"1\">Restart your PC once the process completes.<\/li>\n<\/ul>\n<h3>Method 5: Change the registry settings<\/h3>\n<p>Some users also said that tweaking their registry settings helped fix the error. You could try doing the same to see if that helps. However, the registry is pretty sensitive. So, messing up crucial keys could easily damage your computer. Therefore, we suggest that you back up the registry before moving further. Doing so will enable you to easily reverse any mistakes and restore your PC\u2019s health.<\/p>\n<div class=\"notebox\">\r\n\t<div class=\"notebox__heading\">Warning<\/div>\r\n\t<div class=\"notebox__text\">Before proceeding with modifications to the Windows Registry, be aware of the significant risks involved. Incorrect changes can lead to system instability or even prevent Windows from booting. Always <a href=\"https:\/\/www.auslogics.com\/en\/articles\/how-to-back-up-and-restore-the-windows-10-registry\/\">back up the registry <\/a> first and consider this step only as a last resort after exhausting safer methods. If unsure, seek assistance from a professional to avoid potential damage to your system. <\/div>\r\n<\/div>\r\n\n<p>Follow these steps to back up the registry:<\/p>\n<ul>\n<li aria-level=\"1\">Press the <code>Windows key + R<\/code> combo to open Run.<\/li>\n<li aria-level=\"1\">Type in <code>regedit<\/code> and click the OK button.<\/li>\n<li aria-level=\"1\">Click on the Yes button when the UAC window pops up.<\/li>\n<li aria-level=\"1\">Select <em>\u201cFile\u201d<\/em> in the upper-left corner of the Registry Editor. Then, choose <em>Export.<\/em><\/li>\n<li aria-level=\"1\">Select where to store the backup file, and then name it.<\/li>\n<li aria-level=\"1\">Finally, click on the Save button.<\/li>\n<\/ul>\n<p>Now use this quick guide to tweak your registry settings:<\/p>\n<ul>\n<li aria-level=\"1\">Open the Run dialog box (<code>Win + R<\/code>).<\/li>\n<li aria-level=\"1\">Type in <code>regedit<\/code>. Then, hit enter.<\/li>\n<li aria-level=\"1\">Choose Yes on the UAC prompt to open the Registry Editor.<\/li>\n<li aria-level=\"1\">Navigate to the following path:<\/li>\n<\/ul>\n<p><code>HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows Defender <\/code><\/p>\n<ul>\n<li aria-level=\"1\">Once here, find <em>\u201cDisableAntiSpyware\u201d<\/em> on the right pane. If you can\u2019t locate it, right-click on the right pane, choose<em> \u201cNew,\u201d<\/em> and select \u201cDWORD (32-bit) Value.\u201d Name this file <em>\u201cDisableAntiSpyware.\u201d<\/em><\/li>\n<li aria-level=\"1\">Now right-click on<em> \u201cDisableAntiSpyware\u201d<\/em> and select <em>Modify.<\/em><\/li>\n<li aria-level=\"1\">Change the Value data to \u201c0\u201d and click on the OK button.<\/li>\n<li aria-level=\"1\">Close the Registry Editor and reboot your machine.<\/li>\n<li aria-level=\"1\">Check if this technique worked.<\/li>\n<\/ul>\n<hr \/>\n<p><b>Also read:<\/b><a href=\"https:\/\/www.auslogics.com\/en\/articles\/registry-cleaner\/\">What Is the Windows Registry and Why Do You Need a Registry Cleaner? <\/a><\/p>\n<hr \/>\n<h2>How to Fix Windows Defender Service That Won\u2019t Start on Windows 10?<\/h2>\n<p>Ensuring the smooth operation of Windows Defender on your Windows 10 PC is essential for maintaining your system\u2019s security, particularly if you rely on it as your primary antivirus solution.\u00a0 This guide has walked you through several methods to troubleshoot and resolve instances where Windows Defender fails to start, ranging from simple checks like ensuring your date and time are correct to more complex solutions involving registry edits. Remember, while these solutions are effective for most, always proceed with caution, especially when making changes to your system\u2019s registry, and consider professional advice if you\u2019re unsure. By following these steps carefully, you should be able to restore Windows Defender\u2019s functionality and keep your computer protected against threats.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Keeping the Windows Defender enabled is crucial, especially if you don\u2019t have another antivirus on your PC.<\/p>\n","protected":false},"author":77,"featured_media":59269,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[851,819,813,873],"tags":[23,1105,619],"class_list":["post-4085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-device-security","category-how-tos","category-security","category-windows-system","tag-pc-diagnostics","tag-windows-defender","tag-windows-tweaks"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Fix Windows Defender Service That Won\u2019t Start on Windows 10 &#8212; Auslogics Blog<\/title>\n<meta name=\"description\" content=\"Solve Windows Defender startup issues on Windows 10. 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Learn how to fix the service that won&#039;t start and protect your system.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.auslogics.com\/en\/articles\/how-to-fix-windows-defender-service-wont-start-on-windows\/\" \/>\n<meta property=\"og:site_name\" content=\"Auslogics Blog | Tips to Diagnose &amp; Resolve Computer Issues\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Auslogics\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-29T16:41:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-07T17:53:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.auslogics.com\/en\/articles\/wp-content\/uploads\/2024\/03\/How-to-Fix-Windows-Defender-Service-That-Wont-Start-on-Windows-10-2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1792\" \/>\n\t<meta property=\"og:image:height\" content=\"1024\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Samuel Nzube\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"Solve Windows Defender startup issues on Windows 10. 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