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Windows Defender Firewall helps protect your computer by preventing unauthorized users from gaining access to your computer through the Internet or a network. Select Microsoft Defender Antivirus in the list and click the Turn on button.Windows Defender Firewall (mpssvc) Service Defaults in Windows 10 A list of installed antivirus or antispyware programs is displayed.Click the View installed antivirus apps or View installed antispyware apps option.In the Security and Maintenance window, click the Security option to expand that section.If a link is not available in the pop-up message, you need to open the Control Panel and access the Security and Maintenance option.Microsoft Defender Antivirus is now enabled. If available, click the click here to turn it on link in that pop-up message. You should see a pop-up message stating the program is turned off.On the Options screen, in the left navigation pane, click Administrator.On the Tools and Settings screen, click Options.

Click the Tools option in the top menu.

Microsoft Defender Antivirus is enabled by default, so there is no need to manually enable it unless it was previously disabled. How do I enable or disable Microsoft Defender Antivirus? If you have another antivirus program installed on your computer, like AVG, McAfee, or Webroot, Microsoft Defender Antivirus is disabled to prevent conflicts with the antivirus program.

In the Windows search box, type antivirus or microsoft defender.

To open Microsoft Defender manually, follow the steps below. Microsoft Defender automatically starts and runs each time your computer starts up, unless it is disabled. How do I open Microsoft Defender Antivirus?

The latest versions of Microsoft Windows come with Microsoft Defender for free. Does Microsoft charge for Microsoft Defender Antivirus?

It is also available with Windows Vista and Windows 7, but only protects against spyware.

There is no need to download and install Microsoft Defender Antivirus, as it is installed by default on Windows 8 and Windows 10. It was first released on October 24, 2006. It detects and removes viruses, spyware, and malware, helping to protect the operating system from infection.įormerly known as Microsoft AntiSpyware and Windows Defender, the software was originally based on GIANT AntiSpyware, acquired by Microsoft on December 16, 2004. Microsoft Defender Antivirus is antivirus software developed by Microsoft to protect computers running Windows.