Cancel Submit. Hi Leon. Windows is designed to detect any installed antivirus software, and certain issues can occur if you have two or more antivirus software installed.
These issues include conflicts between antivirus software that can manifest as frequent freezing, crashing to applications, etc.
Since this is a common problem, in order to avoid any conflicts, Windows Defender will turn itself off if Windows detects any other security program. In addition, if this security software has a Firewall, Windows Firewall will also turn itself off. Often users are not aware whether security software is installed or not because when you buy a new laptop in most cases it comes with a trial version of antivirus software such as Norton, McAfee etc.
When you install applications like Flash or Java it might prompt you to uninstall free security scanner, and that can cause some problems. Head over to the Settings and check Turn on real time protection. Solution 2 — Change date and time Another cause for Windows Defender to not work properly is incorrect time and date. Solution 3 — Update Windows Make sure that you keep your Windows up to date using Windows Update, since this can cause some problems with Windows Defender.
When it comes to any security software, make sure that you update it frequently and download Windows updates using Windows Update. If any permission that was inherited, click on the Change permissions option and remove the permission entry.
After this, save the changes and exit the File Explorer, restart your PC and check whether you are able to start Windows Defender. As reported by many users, performing a clean boot on their PC helped them get rid of this issue. It is a fairly simple process and has helped many users get rid of various Windows errors and issues like the Windows Defender not starting. Go ahead and create a New User Account in Windows. After creating the new account, log off from your current user profile, and log in using the new profile.
If the solution works, using the new account is advised. In order to deal with the Windows Defender not starting issue, you can run a Registry fix on your PC. Here are the steps to follow:. Type regedit in the Run box and select Ok.
Step 2 : In Registry Editor, go to the left pane and navigate to the following location:. Now, right click on the Windows Defender folder and click on the Permissions option. Step 5 : The Select User or Group window will open. Here, in the Enter the object name to select section, type Administrator and click on the Ok option.
Step 6 : You will be taken back to the previous window. Here, select the Replace owner on subcontainers and objects checkbox. After that, go to the Permission entries section and double click on the Administrator entry. Not you? Save information for future comments. If Windows Defender is not working, that's usually caused by the fact that it detects another antimalware software. Make sure you uninstall the third-party security solution completely, with a dedicated program.
Try checking the system file by using some built-in, command-line tools from your OS. You should also consider using a full-fledged antivirus solution to secure your PC. To fix various PC problems, we recommend Restoro PC Repair Tool: This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Click Repair All to fix issues affecting your computer's security and performance Restoro has been downloaded by 0 readers this month.
Free trial Visit website. Still having issues? Fix them with this tool:. How do I update my Windows Defender signature? What is Windows Defender process name? This article covers: Topics: Windows Defender issues. Was this page helpful? Thank you! There are 8 comments. Copy link. Software deals Friday round-up. I agree with the Privacy Policy regarding my personal data. More on this Topic November 10, You should repeat this procedure for all starting apps except the known critical apps that should start during the system boot.
Select to restart your computer now. Third-party programs can sometimes interact with Windows and cause this issue to occur. Nevertheless, by doing a Clean Boot, you can locate the offending program. Check to see whether the problem remains after restarting your computer. It implies that one of the deactivated applications or services was the source of the issue.
To locate the faulty app or service, you must activate them one by one or in groupings until the issue is reproduced. Now disable or remove the program, and it should address the problem. Some antivirus software has a dedicated removal program, which you may use to remove the antivirus quickly.
Following the completion of the scan, the repair procedure will install new files with new Windows files and bits. You may also use an uninstaller program to uninstall your antivirus entirely from your computer.
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