The Windows Defender client's real-time protection feature encountered an error because one of the services failed to start.If it is followed by a 3007 event ID, the failure was temporary and the antimalware client recovered from the failure.Product datasheet Upgrade Price Guarantee Compatible with Windows 10, 8.1, 8, 7, Vista and XP, 32 Bit / 64 Bit Editions New language versions: Chinese - Lithuanian - Japanese - Polski - Romanian - Spanish - Czech Update Star is compatible with Windows platforms.Update Star has been tested to meet all of the technical requirements to be compatible with Windows 10, 8.1, Windows 8, Windows 7, Windows Vista, Windows Server 2003, 2008, and Windows XP, 32 bit and 64 bit editions.This section provides the following information about Windows Defender Antivirus client errors.Microsoft is conducting an online survey to understand your opinion of the Technet Web site.
Windows 10, versions 1507 (Windows 10 RTM) and 1511 updates can also cause this, though to a lesser extent.
This error is likely caused by a network connectivity issue.
You should restart the system then run a full scan because it's possible the system was not protected for some time.
To troubleshoot this event: Windows Defender could not load antimalware engine because current platform version is not supported.
Windows Defender will revert back to the last known-good engine and a platform update will be attempted.
NOTE: Whenever Windows Defender, Microsoft Security Essentials, Malicious Software Removal Tool, or System Center Endpoint Protection detects a malware, it will restore the following system settings and services which the malware might have changed: The Windows Defender client update failed.