Applications that depend on Task Scheduler stop responding

Applies to: Windows DefenderMicrosoft Security EssentialsSystem Center 2012 Endpoint Protection More


Applications that depend on Windows Task Scheduler may stop responding. The issue is intermittent, and occurs only on computers that are protected by the 1.1.15700.x version of Microsoft Malware Protection Engine. The following products use this engine:

  • Windows Defender Antivirus
  • Microsoft System Center 2012 Endpoint Protection
  • Microsoft Forefront 2007 Endpoint Protection
  • Microsoft Security Essentials


To resolve this issue, update the threat definition files. For information about how to check and update these files, see Definition updates for Windows Defender Antivirus and other Microsoft antimalware on the Windows Defender Security Intelligence website.

Make sure that the current threat definition version is or a later version.

More information

An issue occurs intermittently in Microsoft Malware Protection Engine version 1.1.15700.x. This issue may cause an application to stop responding if the application relies on the Task Scheduler to manage its operations.