This is the most current release of Windows Defender. If Windows Defender informed you that an update is available, you are running an older version. We encourage you to upgrade to this version. You can check your version of Windows Defender by clicking the down arrow next to the help icon and choosing ‘About Windows Defender’.
Note: If you have version 1.1.1592.0, you must first manually uninstall Windows Defender before you can install this newer version. To configure or remove the existing version, use Add/Remove programs in the Control Panel.
This release includes enhanced features that reflect ongoing input from customers, as well as Microsoft’s growing understanding of the malicious software landscape.