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ITsVISTA KB-Link: KB2617046

Duplicate triggers are generated incorrectly in scheduled tasks in Windows Vista or in Windows Server 2008

Consider the following scenario:

  • You install security update 2305420, which is documented in security bulletin MS10-092, on a computer that is running Windows Vista or Windows Server 2008.
  • You create a scheduled task which has at least one trigger.
  • You disable and then enable the scheduled task.

In this scenario, duplicate triggers are generated incorrectly in the scheduled task. The duplicate triggers may cause various issues.

Most of the time, the following events are logged in the Microsoft-Windows-TaskScheduler/Operational log:

Log Name: Microsoft-Windows-TaskScheduler/Operational
Source: Microsoft-Windows-TaskScheduler
Date: date
Event ID: 101
Task Category: Task Start Failed
Level: Error
Keywords:
User: SYSTEM
Computer: computer name
Description:
Task Scheduler failed to start “name” task for user “NT AUTHORITY\System”. Additional Data: Error Value: 2147750687.

Log Name: Microsoft-Windows-TaskScheduler/Operational
Source: Microsoft-Windows-TaskScheduler
Date: date
Event ID: 322
Task Category: Launch request ignored, instance already running
Level: Warning
Keywords:
User: SYSTEM
Computer: computer name
Description:
Task Scheduler did not launch task “name” because instance “GUID” of the same task is already running.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2617046.

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