Application That Requires Schedule Service Fails

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Article ID: 196731 - View products that this article applies to.
This article was previously published under Q196731
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IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information on how to do this, view the "Restoring the Registry" online Help topic in Regedit.exe or the "Restoring a Registry Key" online Help topic in Regedt32.exe.
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Programs that require the use of the Schedule service (Atsvc.exe) provided with Windows NT may fail when you run them on a Windows NT system for which you have also installed Task Scheduler (a Microsoft Internet Explorer 4.0 optional component). You will see inconsistent results when attempting to start a program using the AT commands. An example of such a program is Soon.exe from the Windows NT Resource Kit.


When you install Task Scheduler on Windows NT, it replaces the Schedule service. The Schedule service no longer shows up in the Services utility in Control Panel.


To resolve this problem, do one of the following:

  • Use a different program that is compatible with the Internet Explorer 4.0 Task Scheduler.

  • Remove Task Scheduler by using the Add/Remove Programs tool in Control Panel by selecting "Task Scheduler v1.0 (remove only)" from the Install/Uninstall tab and clicking Add/Remove.
    NOTE: The Add\Remove tool may not show the Task Scheduler v1.0 service.

More information

If the Microsoft Task Scheduler is not automatically removed, the services portion of the registry can be manually modified as indicated below.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

  1. Start Registry Editor.
  2. Change the registry entries for Internet Explorer 4.0 Task Scheduler service:
          Key Name:
          Value Names:
          DependOnGroup: REG_MULTI_SZ
          DependOnService: REG_MULTI_SZ: RpcSs
          DisplayName: REG_SZ: Task Scheduler
          ErrorControl: REG_DWORD: 0x1
          Group: REG_SZ:
          ImagePath: REG_EXPAND_SZ: C:\WINNT\System32\MSTask.exe
          ObjectName: REG_SZ: LocalSystem
          Start: REG_DWORD: 0x3
          Type: REG_DWORD: 0x120

    to the following registry entries for Windows NT AT Schedule Service
          Key Name:
          Value Names:
          ErrorControl:REG_DWORD: 0x1
          ImagePath: REG_EXPAND_SZ: %SystemRoot%\System32\AtSvc.Exe
          ObjectName: REG_SZ: LocalSystem
          Start: REG_DWORD: 0x2
          Type: REG_DWORD: 0x10


Article ID: 196731 - Last Review: October 26, 2013 - Revision: 2.0
Applies to
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition
kbnosurvey kbarchive kbprb KB196731

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