Windows Defender - Download Windows Defender - Windows Server 2012 r2 Defender
Here’s a guide for Microsoft/Windows Defender download, install, uninstall and reinstall on Windows 10/11. Utilize this best free antivirus software for Windows to protect your computer from threats. Windows Defender is a comprehensive security utility built and maintained directly by Microsoft Corporation, the creators of the Windows operating system. Its primary purpose is to observe the activated applications for malicious behavior and monitor all the files present on your local storage, portable storage accessories, and the files that are being downloaded from the internet.
Windows Defender, also known as Microsoft Defender or Windows Security, is a 100% free antivirus program developed by Microsoft. It is included in Windows 11/10/8/8.1/7/Vista.
Windows Defender offers 4 scan modes: full scan, quick scan, custom scan, and offline scan.
By monitoring all your interactions with local and remote files, and especially with executable applications, Windows Defenders serves each user of Windows OS as the first line of defense against the malicious software that can invade your privacy, steal your private, work and sensitive data, corrupt your OS or even lead to a total lockdown of OS capabilities.
To provide the best security possible, this app is automatically configured to perform its duty as best as possible, not demanding from users any permissions, activations, configurations, or any other input. It simply always runs in the background, taking a minimal amount of hardware resources. It automatically scans all active processes giving you reliable real-time protection, protects your PC from all forms of ransomware software, constantly remains in touch with cloud servers that distribute new anti-virus definitions and threat behavior detection algorithms, and much more.
How to Download and Install Windows Defender on Windows 10/11
All computers running Windows 11/10/8/7 come pre-installed with a free copy of Windows Defender. You can normally obtain Windows Defender in one of three ways if it isn't already installed on your machine.
You may watch the tutorial here link Tutorial Video
1. Update Windows OS
You can try to update Windows 11/10 to the latest version to see if Windows Defender comes back.
To update your system, you can click Start -> Settings -> Update & Security (Privacy & Security) -> Windows Update -> Check for updates. You can also use this way to update Windows Defender to the latest version on Windows 10/11.
2. Manually Download and Install Windows Defender on Windows 10/11
Open Microsoft Store on your Windows computer or press Windows + S, search for Microsoft Store in the search box, and click the Microsoft Store app to open it.
In Microsoft Store, you can type Microsoft Defender Preview in the search box, and choose the Microsoft Defender Preview app.
Click the Get button or Get in Store app button to download Microsoft Defender for Windows 10 or 11.
3. Third-party Windows Defender Download Websites
Find some third-party reliable websites to get Microsoft Defender. Some websites are listed below for your reference, but important for you, identify by yourself if the Windows Defender download resource is reliable.
Link 1 Download Windows Defender
Link 2 Download Windows Defender
Link 3 Download Windows Defender
Fix Windows Defender Can’t Open/Start on Windows 10/11
10 tips below to see if they can help bring this free antivirus app back to normal working:
1. Restart your computer and try to open Windows Defender again.
2. Update Windows system.
3. Run SFC scan.
You can perform a system scan to repair possible corrupted system files in your device.
Press Windows + R, type cmd, and press Ctrl + Shift + Enter to open Windows Command Prompt.
Type sfc /scannow command and press Enter to run the SFC tool to automatically check and fix corrupted system files. If this command doesn’t work, you can type DISM /Online /Cleanup-image /RestoreHealth command and press Enter to run this command first.
4. Reset Windows Defender app.
If Windows Defender is not working well on your computer, follow the operation below to reset the app settings to default to see if it helps.
Press Windows + X and select Windows PowerShell (Admin). For Windows 11, select Windows Terminal (Admin).
Type the command: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage. Press Enter to execute the command.
5. Uninstall and reinstall Windows Defender.
6. Disable any third-party antivirus software on your computer since it may be conflicted with the Windows Defender antivirus program.
7. Use third-party antivirus software.
8. Start Windows in Safe Mode to see if Windows Defender can smoothly open and work.
9. Perform a System Restore. If you still favor Windows Defender and do not want to use other antivirus applications, you can try to restore your Windows system to a previous state to see if the Windows Security app can work properly.
10. If Windows Defender is not working and you have some other problems on your computer, you may reinstall your Windows OS.
Note: Before you perform the system restore or reinstall your computer, it’s highly advised you make a backup of your Windows system and important data.
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