%PDF-1.4 %âãÏÓ 1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj 2 0 obj << /Type /Pages /Count 3 /Kids [5 0 R 7 0 R 9 0 R] >> endobj 3 0 obj << /Type /Font /Subtype /Type1 /BaseFont /Helvetica >> endobj 4 0 obj << /Type /Font /Subtype /Type1 /BaseFont /Helvetica-Bold >> endobj 5 0 obj << /Type /Page /Parent 2 0 R /MediaBox [0 0 595.28 841.89] /Resources << /Font << /F1 3 0 R /F2 4 0 R >> >> /Contents 6 0 R >> endobj 6 0 obj << /Length 5392 >> stream BT /F2 22 Tf 0.06 0.08 0.12 rg 1 0 0 1 46 789.89 Tm (How to Fix if Windows Defender does not Update) Tj ET BT /F2 11 Tf 0.72 0.14 0.18 rg 1 0 0 1 46 752.89 Tm (TechRounder PDF Edition) Tj ET BT /F1 9.5 Tf 0.36 0.39 0.46 rg 1 0 0 1 46 736.89 Tm (Live article: https://www.techrounder.com/windows/how-to-fix-if-windows-defender-does-not-update/) Tj ET q 0.82 0.85 0.9 RG 1 w 46 718.39 m 549.28 718.39 l S Q BT /F1 10 Tf 0.24 0.27 0.32 rg 1 0 0 1 46 706.39 Tm (By Vipin PG | Published October 21, 2020 | Updated March 8, 2026 | Format: Guide | 5 min read) Tj ET BT /F2 13 Tf 0.72 0.14 0.18 rg 1 0 0 1 46 683.39 Tm (Quick answer) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 663.39 Tm (Windows Defender is inbuilt software found in Windows 10 to protect your computer from Malware) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 648.39 Tm (Antivirus and other harmful third-party sources. Many Windows 10 users report that Windows) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 633.39 Tm (Defender does not start or update on their PC.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 608.39 Tm (Windows Defender is inbuilt software found in Windows 10 to protect your computer from Malware) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 593.39 Tm (Antivirus and other harmful third-party sources. Many Windows 10 users report that Windows) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 578.39 Tm (Defender does not start or update on their PC. It is one of the common issues.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 556.39 Tm (There are several reasons for this issue. Windows defender fails typically to update when the internet) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 541.39 Tm (connection is not so good. So make sure you have a good internet connection while you update windows) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 526.39 Tm (defender. Also, if an Admin manages your system, then they might filter updates. Check with your) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 511.39 Tm (admin before you confirm that there is some other issue in updating Windows Defender.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 489.39 Tm (There are many reasons why Windows defender does not start or update on Windows 10. We have) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 474.39 Tm (listed a dozen solutions below for you. You cannot blindly say that this is the main reason for the) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 459.39 Tm (problem without trying a couple of solutions.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 437.39 Tm (Once you start trying some of the solutions listed here, you will know the problem and how it can be) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 422.39 Tm (rectified. But make sure that a system is updated before you update windows Defender. Sometimes) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 407.39 Tm (when the system has an older version, the newer version of Windows Defender might show some) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 392.39 Tm (problems while installing or updating.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 370.39 Tm (Below are some of the solutions that we have formulated to help you.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 342.39 Tm (Solution 1: Use a Registry Cleaner) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 318.39 Tm (Some old files and programs that were previously installed on your PC might object to starting the) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 303.39 Tm (updated Windows Defender. You can do a registry clean-up to clean all the unwanted programs and) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 288.39 Tm (files that were previously useful but not now are not updated.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 266.39 Tm (There are a lot of third-party tools and apps for a registry clean-up. You can use any one among them) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 251.39 Tm (to do a registry clean up. Also, try restarting your PC after you do it. It will refresh the old settings and) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 236.39 Tm (might help you start Windows Defender.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 208.39 Tm (Solution 2: Update Windows version to the latest one) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 184.39 Tm (If you do not have an updated version of your Windows, then try to install the newer version of) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 169.39 Tm (Windows Defender because it will prevent windows defender from being installed and opened. It is) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 154.39 Tm (because both the versions of Windows and Windows Defender have to be updated. So, if your Windows) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 139.39 Tm (10 version is not updated, then try updating it by the below-mentioned steps:) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 117.39 Tm (Step 1: Open the settings option in your Windows 10) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 95.39 Tm (Step 2: Select the update and security option from the list.) Tj ET q 0.86 0.88 0.92 RG 1 w 46 42 m 549.28 42 l S Q BT /F1 8.4 Tf 0.42 0.45 0.5 rg 1 0 0 1 46 30 Tm (TechRounder | Page 1 of 3) Tj ET BT /F1 7.2 Tf 0.42 0.45 0.5 rg 1 0 0 1 46 19 Tm (https://www.techrounder.com/pdf/blog/how-to-fix-if-windows-defender-does-not-update.pdf) Tj ET endstream endobj 7 0 obj << /Type /Page /Parent 2 0 R /MediaBox [0 0 595.28 841.89] /Resources << /Font << /F1 3 0 R /F2 4 0 R >> >> /Contents 8 0 R >> endobj 8 0 obj << /Length 5099 >> stream BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 789.89 Tm (Step 3: The update menu will be opened, and you can find two options, Windows update, and Windows) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 774.89 Tm (Defender, on the left side panel.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 752.89 Tm (Step 4: Click the windows update. The windows version you have will be displayed on the screen along) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 737.89 Tm (with an option saying check for updates) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 715.89 Tm (Step 5: Click the check for updates option.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 693.89 Tm (Now the system will be scanned, and you will be intimated with any update available. You have to click) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 678.89 Tm (and install the update. Ensure that you have a good internet connection as windows update takes a long) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 663.89 Tm (time to install.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 635.89 Tm (Solution 3: System File Checker Scan) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 611.89 Tm (Running a system file checker scan might help you identify corrupt files in your system that may) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 596.89 Tm (hinder the opening of Windows Defender. When your system files have issues, they do not work) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 581.89 Tm (correctly or slow down your PC.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 559.89 Tm (Step 1: Open Command Prompt in your PC. It is a default Command-line Prompter inbuilt in Microsoft) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 544.89 Tm (Windows.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 522.89 Tm (Step 2: If you right-click on the app short menu will appear.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 500.89 Tm (Step 3: The first option that says run as administrator) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 478.89 Tm (Step 4: Now, a black window which is called Command Prompt Window will appear.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 456.89 Tm (Step 5: Type sfc/ scan now in it and click enter) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 434.89 Tm (After you do this the scan, you can start. It might take some time to complete the scan and destroy all) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 419.89 Tm (the junk files. So, after the scan is completed, you can restart your PC and try running Windows) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 404.89 Tm (Defender.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 376.89 Tm (Solution 4: Uninstall the antivirus in your PC) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 352.89 Tm (When there is some antivirus installed in your PC window, the defender cannot start because the) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 337.89 Tm (antivirus diffuses into some of the system's settings. It will not allow windows defender to perform.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 315.89 Tm (Windows Defender is essentially doing the part of antivirus on your computer. If you install any other) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 300.89 Tm (antivirus software, it will not be possible for both software to perform correctly.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 278.89 Tm (First, disable your antivirus and then try running Windows Defender. If it does not work, then try) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 263.89 Tm (uninstalling your antivirus using software remover tools. This software removing tools help you to) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 248.89 Tm (clear the residue files of the old antivirus from system folders.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 226.89 Tm (Once you finish uninstalling, try running Windows Defender. In most cases, after uninstalling antivirus,) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 211.89 Tm (windows defender runs smoothly. If this method does not work, then try the following methods.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 183.89 Tm (Solution 5: Microsoft directory permissions) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 159.89 Tm (If Microsoft directory is not allowed, specific permissions windows defender will not start properly.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 144.89 Tm (You need to allow Microsoft to directory all the permissions first. Follow the below steps to allow) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 129.89 Tm (Microsoft to directory all the permissions.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 107.89 Tm (Step 1: Open this PC then navigate to local disk C) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 85.89 Tm (Step 2: Find the program data option there) Tj ET q 0.86 0.88 0.92 RG 1 w 46 42 m 549.28 42 l S Q BT /F1 8.4 Tf 0.42 0.45 0.5 rg 1 0 0 1 46 30 Tm (TechRounder | Page 2 of 3) Tj ET BT /F1 7.2 Tf 0.42 0.45 0.5 rg 1 0 0 1 46 19 Tm (https://www.techrounder.com/pdf/blog/how-to-fix-if-windows-defender-does-not-update.pdf) Tj ET endstream endobj 9 0 obj << /Type /Page /Parent 2 0 R /MediaBox [0 0 595.28 841.89] /Resources << /Font << /F1 3 0 R /F2 4 0 R >> >> /Contents 10 0 R >> endobj 10 0 obj << /Length 3778 >> stream BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 789.89 Tm (Step 3: Locate the Microsoft file there.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 767.89 Tm (Step 4: Right-click and select the properties option.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 745.89 Tm (Step 5: The Microsoft properties tab will open, select security from the top panel, and click advanced) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 730.89 Tm (at the bottom) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 708.89 Tm (Step 6: Now, the Microsoft tab's advanced security settings will open, click on the permissions option,) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 693.89 Tm (and look for the inherited permissions.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 671.89 Tm (Step 7: If some of the permissions are not allowed; click the change permissions option at the left) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 656.89 Tm (bottom.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 634.89 Tm (Make sure that all the permissions are not inherited from anywhere. If they are inherited, then) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 619.89 Tm (remove the program. Now restart your PC again and try running Windows Defender.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 591.89 Tm (Solution 6: Creating a new user account) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 567.89 Tm (If none of the above methods work, then try creating a new user profile. Due to some bugs in the old) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 552.89 Tm (profile or windows defender, it might not accept interest from the old profile.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 530.89 Tm (So, log out from your old profile and try opening a new profile and entering. If this method works) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 515.89 Tm (perfectly, then continue with the new profile. You can always import your files and data from the old) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 500.89 Tm (profile to the new.) Tj ET BT /F2 15 Tf 0.08 0.1 0.14 rg 1 0 0 1 46 472.89 Tm (Wrapping up) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 448.89 Tm (These are some of the basic methods you can do for yourself if your Windows Defender does not) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 433.89 Tm (open or update. If none of these methods work, you must contact your service provider. There are) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 418.89 Tm (many reasons why the windows defender might not start or update. You will need a computer expert to) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 403.89 Tm (identify and rectify the issue, but we have provided you with a list of solutions to save your time and) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 388.89 Tm (money.) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 366.89 Tm (These are some of the methods that many of the users tried and proved right, so most of it will work) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 351.89 Tm (in 90 percent of cases. The Main bug in opening windows defender is a poor internet connection and) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 336.89 Tm (outdated versions. If these main problems are rectified, then your Windows Defender must work) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 321.89 Tm (100% correctly. If you want windows defender to work on your PC, then make sure you have) Tj ET BT /F1 11 Tf 0.14 0.16 0.2 rg 1 0 0 1 46 306.89 Tm (everything right for it to run.) Tj ET q 0.86 0.88 0.92 RG 1 w 46 42 m 549.28 42 l S Q BT /F1 8.4 Tf 0.42 0.45 0.5 rg 1 0 0 1 46 30 Tm (TechRounder | Page 3 of 3) Tj ET BT /F1 7.2 Tf 0.42 0.45 0.5 rg 1 0 0 1 46 19 Tm (https://www.techrounder.com/pdf/blog/how-to-fix-if-windows-defender-does-not-update.pdf) Tj ET endstream endobj xref 0 11 0000000000 65535 f 0000000015 00000 n 0000000064 00000 n 0000000133 00000 n 0000000203 00000 n 0000000278 00000 n 0000000420 00000 n 0000005863 00000 n 0000006005 00000 n 0000011155 00000 n 0000011298 00000 n trailer << /Size 11 /Root 1 0 R >> startxref 15128 %%EOF